Terrorism in the United States
Terrorist incidents in United States 
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A common definition of terrorism is the systematic use or threatened use of violence in order to intimidate a population or government and thereby effect political, religious, or ideological change. This article serves as a list and compilation of acts of terrorism, attempts of terrorism, and other such items pertaining to terrorist activities within the domestic borders of the United States by non-state actors or spies acting in the interests of or persons acting without approval of state actors.
Attacks by date
- November 7, 1837: A pro-slavery mob killed abolitionist Elijah P. Lovejoy, editor of the Alton Observer.
- August 6-November 1, 1838: 1838 Mormon War — As Mormons began to pour into Missouri (which Mormons considered their "promised land"), their distinct theology and abolitionist tendencies were met with friction by the locals, which soon escalated into accusations, recriminations, and ultimately armed violence. After some skirmishing, the Mormon Extermination Order was passed, and the murder of Mormons was legalized in the state of Missouri. Eventually, Mormons were almost completely driven from the state of Missouri.
- May 21, 1856: Sacking of Lawrence – Pro-Slavery forces enter Lawrence, Kansas to disarm residents and destroy the town's presses and the Free State Hotel.
- September 11, 1857: Mountain Meadows Massacre — During the Utah War, Mormon militias, fueled by paranoia, attack the Baker–Fancher Party wagon train, killing everyone older than 7. The party's 17 very young children were kidnapped into Mormon families, and the party's property was auctioned off to the Mormon community. Mormons attempted unsuccessfully to blame the slaughter on Indians. Some 120 people were murdered in cold blood, making this attack the single deadliest act of terrorism on US soil until the Oklahoma City bombing of 1995.
- October 16, 1859: Anti-slavery Pottawatomie massacre – In response to the sacking of Lawrence, John Brown led a group of abolitionists to murder five Kansas settlers from Tennessee, whom he presumed to be pro-slavery.
- April 14, 1865: Pro-slavery Abraham Lincoln assassination – Part of a conspiracy by Confederate supporters John Wilkes Booth, Lewis Powell and George Atzerodt to assassinate President Abraham Lincoln, Vice President Andrew Johnson and Secretary of State William Seward in Washington, D.C. to create chaos for the purpose of overthrowing the Federal Government. Booth succeeded in assassinating Lincoln at Ford's Theatre, Seward suffered numerous stab wounds by Powell who stabbed others as he was chased out of Seward's home, and Atzerodt failed to carry out the planned murder of Johnson. Booth was killed by soldiers when he failed to surrender. Eight conspirators were tried and convicted for their role in the conspiracy by a military tribunal, including Powell and Atzerodt. Four defendants were executed for their roles including Powell, Azterodt and Mary Surratt, the first woman ever to be hanged by the U.S. government, whom historians mostly conclude was innocent.
- May 4, 1886: Haymarket affair – An unknown person or persons at Haymarket Square in Chicago detonated a bomb during a labor rally, killing a police officer and prompting the police to open fire. In the mayhem, an undetermined number of civilians and seven more police officers were killed, mostly by the police shooting in response. Eight anarchists were convicted of conspiracy, and four of them hanged the next year. One killed himself, and the remaining three were later pardoned.
- October 28, 1893: Carter Harrison assassination-Patrick Eugene Joseph Prendergast was upset that the Mayor of Chicago, Carter Harrison, Sr., advocated for the repeal of the Sherman Silver Purchase Act of 1890, seeing it as an action against the citizenry and acting under the influence of England, the Rothschild bankers of Europe, and Wall St. Prendergast imagined this as part of a larger conspiracy that betrayed the will of Jesus Christ. As a delusional newspaper man, he found himself unable to influence policy in Washington or Chicago and ultimately took it upon himself to change the course of history by assassinating the powerful mayor. He felt that his inevitable acquittal would establish a precedent wherein Christian law would be established throughout the city. Prendergast was found sane by a jury and hanged on July 14, 1894.
- September 6, 1901: President William McKinley was assassinated by Michigan-born anarchist Leon Czolgosz, in Buffalo, New York.
- December 30, 1905: Former Idaho Governor Frank Steunenberg was killed by a bomb in front of his Caldwell, Idaho home. The assassin, Harry Orchard, turned state's evidence and accused the Western Federation of Miners of having hired him to assassinate Steunenberg in retaliation for breaking up miners' strikes. However, the labor leaders put on trial due to his accusations were acquitted as defense attorneys Clarence Darrow and Edmund F. Richardson successfully discredited Orchard's testimony.
- October 1, 1910: Los Angeles Times bombing. The Los Angeles Times building in Los Angeles was destroyed by dynamite, killing 21 workers. The bomb was apparently placed due to the paper's opposition to unionization in the city; two labor organizers, the McNamara brothers, were found guilty.
- May 30, 1915: German agents blew up a barge carrying 15 tons of refined gunpowder just off of Harbor Island, Seattle, Washington.
- July 2, 1915: Frank Holt (also known as Eric Muenter), a German professor who wanted to stop American support of the Allies in World War I, exploded a bomb in the reception room of the U.S. Senate. The next morning he tried to assassinate J. P. Morgan, Jr. the son of the financier whose company served as Great Britain's principal U.S. purchasing agent for munitions and other war supplies. Muenter was overpowered by Morgan in Morgan's Long Island home before killing himself in prison on July 7.
- July 22, 1916: The Preparedness Day Bombing killed ten people and injured 40 in San Francisco. Two radical labor leaders, Warren K. Billings and Thomas Mooney, were convicted of the crime and sentenced to hang, but with little evidence of their guilt both sentences were commuted to life imprisonment. They were eventually pardoned, and the actual bombers' identities remain unknown.
- July 30, 1916: The Black Tom explosion in Jersey City, New Jersey was an act of sabotage on American ammunition supplies by German agents to prevent the materiel from being used by the Allies in World War I.
- November 24, 1917: A bomb exploded in a Milwaukee police station, killing nine officers and a civilian. Anarchists were suspected.
- 1919 United States anarchist bombings: A series of package bombs were mailed to prominent business and government leaders around the country. Most were intercepted and did not go off, with only one person killed. Italian Galleanist anarchists were suspected, but not convicted.
- 1920 Wall Street bombing: A horse-drawn wagon filled with explosives was detonated in front of the J. P. Morgan bank on Wall Street, killing 38 and wounding 143. Galleanist anarchists were again suspected, but the perpetrators were never caught.
- May 31, 1921: During the Tulsa race riot, there were reports that whites dropped dynamite from airplanes onto a black neighborhood in Tulsa known as the Black Wall Street. The riot killed 39–300 people and destroyed more than 1,100 homes and hundreds of businesses.
- October 10, 1933: A Boeing 247 was destroyed in mid-flight over Indiana by a nitroglycerin bomb. All seven people aboard were killed. This incident was the first proven case of air sabotage in the history of aviation. The identity of the perpetrator and the motive for the attack are unknown.
- July 4, 1940: Two New York City policemen were killed and two critically wounded while examining a bomb they had found at the British Pavilion at the World's Fair.
- 1940–1956: George Metesky, the Mad Bomber, placed over 30 bombs in New York City in public places such as Grand Central Station and The Paramount Theatre injuring ten during this period in protest of the high rates of a local electric utility. He also sent many threatening letters to various high profile individuals.
- 1951: A wave of hate-related terrorist attacks occurred in Florida. African-Americans were dragged and beaten to death, with 11 race-related bombings, the dynamiting of synagogues, and a Jewish School in Miami and explosives found outside of Catholic Churches in Miami.
- October 12, 1958: Bombing of the Hebrew Benevolent Congregation Temple of Atlanta, Georgia. The acts were carried out by white supremacists.
- 1960: The Sunday Bomber detonated a series of bombs in the New York City Subway. and ferries during Sundays and Holidays, killing one woman and injuring 51 other commuters.
- April 1968: Students at Trinity College hold the board of trustees captive until their demands were met.
- April 23–30, 1968: During a student rebellion at New York's Columbia University members of the New Left organization Students for a Democratic Society and Student Afro-American Society held a dean hostage, demanding an end to both military research on campus and construction of a gymnasium in nearby Harlem.
- June 5, 1968: Senator Robert F. Kennedy while campaigning for U.S. presidency during the 1968 United States Presidential election was shot to death by Palestinian-Jordanian Sirhan Sirhan in the kitchen of the Ambassador Hotel in Los Angeles, California. (See Assassination of Robert F. Kennedy)
- November 1968: Officials of San Fernando State College held at knife point by students.
- January 1, 1969 – April 15, 1970: 8200 Bombings, attempted bombings and bomb threats attributed to "campus disturbances and student unrest"
- February 1969: Secretary at Pomona College severely injured by bomb.
- March 1969: Student critically injured while attempting to bomb a San Francisco State College classroom.
- August 7. 1969: Twenty were injured by radical leftist Sam Melville in a bombing of the Marine Midland Building in New York City.
- August 8, 1969: United States Department of Commerce offices in New York City was damaged by bombing.
- September 18, 1969: The Federal Building in New York City was bombed by radical leftist Jane Alpert.
- October 7, 1969: Fifth floor of the Armed Forces Induction Center in New York City was devastated by explosion attributed to radical leftist Jane Alpert.
- November 12, 1969: A bomb was detonated in the Manhattan Criminal Court building in New York City. Jane Alpert, Sam Melville, and 3 other militant radical leftists are arrested hours later.
- The most active perpetrators of terrorism in New York City were Fuerzas Armadas de Liberacion Nacional (FALN), a Puerto Rican separatist group, responsible for 40 NYC attacks in this decade. The Jewish Defense League (JDL), which engaged in attacks against targets it perceived to be anti-Semitic, launched 27 attacks during this period. Both the Independent Armed Revolutionary Commandos (CRIA), another Puerto Rican separatist group, and Omega 7, an anti-Castro Cuban organization, were also each responsible for 16 attacks during this period.
- April 1970: At Stanford University over a period of several nights bands of student radicals systematically set fires, break windows and throw rocks.
- May 1970: In reaction to the U.S. invasion of Cambodia, Kent State shootings, and Jackson State killings a Fresno State College computer center was destroyed by a firebomb. While reaction to these three events was massive, most were peaceful.
- August 24, 1970: Sterling Hall bombing at the University of Wisconsin–Madison in protest of the Army Mathematics Research Center and the Vietnam War, killing one. Bombers Karleton Armstrong, Dwight Armstrong, David Fine, and Leo Burt claimed the death of physicist Robert Fassnacht was unintentional but acknowledged that they knew the building was occupied when they planted the bomb.
- November 21, 1970: Bombing of the City Hall of Portland, Oregon in an attempt to destroy the state's bronze Liberty Bell replica. The late night explosion destroyed the display foyer, blew out the building doors, damaged the council hall, and blew out windows more than a block away. The night janitor was injured in the blast. The crime remains unsolved, though a number of local anti-war and radical leftist groups of the era remain the primary suspects.
- 1970: The Jewish Defense League was linked to a bomb explosion outside of Aeroflot's New York City office in protest of the treatment of Soviet Jews.
- 1971: The Jewish Defense League was linked to a detonation outside of Soviet cultural offices in Washington, D.C. and rifle fire into the Soviet mission to the United Nations.
- March 1, 1971: The radical leftist group Weatherman exploded a bomb in the United States Capitol to protest the U.S. invasion of Laos.
- June 1, 1973: Yosef Alon, the Israeli Air Force attache in Washington, D.C., was shot and killed outside his home in Chevy Chase, Maryland. The Palestinian militant group Black September was suspected, though the case remains unsolved.
- June 13, 1974: The 29th floor of the Gulf Tower in Pittsburgh, Pennsylvania, was bombed with dynamite at 9:41 pm resulting in no injuries. The radical leftist group Weatherman took credit, but no suspects have ever been identified.
- Summer 1974: "Alphabet Bomber" Muharem Kurbegovich bombed the Pan Am Terminal at Los Angeles International Airport, killing three and injuring eight. He also firebombed the houses of a judge and two police commissioners as well as one of the commissioner's cars. He burned down two Marina Del Rey apartment buildings and threatened Los Angeles with a gas attack. His bomb defused at the Greyhound Bus station was the most powerful the LAPD bomb squad had handled up until that time. His personal vendetta against a judge and the commissioners grew into demands for an end to immigration and naturalization laws, as well as any laws about sex.
- December 29, 1975: LaGuardia Airport Bombing killed 11 and injured 75. The bombing remains unsolved.
- January 24, 1975: A bomb was exploded in the Fraunces Tavern of New York City, killing four people and injuring more than 50 others. The Puerto Rico nationalist group FALN, the Armed Forces of Puerto Rican National Liberation, which had other bomb incidents in New York in the 1970s, claimed responsibility. No one was ever prosecuted for the bombing.
- September 11, 1976: Croatian terrorists hijacked a TWA airliner and diverted it to Gander, Newfoundland and Labrador, and then Paris, demanding a manifesto be printed. One police officer was killed and three injured during an attempt to defuse a bomb that contained their communiques in a New York City train station locker. Zvonko Bušić who served 32 years in prison for the attack, was released and returned to Croatia in July 2008. In September 2013 Bušić shot himself and was given a hero's funeral by the Croatian government.
- September 21, 1976: Orlando Letelier, a former member of the Chilean government, was killed by a car bomb in Washington, D.C. along with his assistant Ronni Moffitt. The killing was carried out by members of the Chilean Intelligence Agency, DINA.
- June 3, 1980: Bombing of the Statue of Liberty. At 7:30 pm, a time delayed explosive device detonated in the Statue of Liberty's Story Room. Detonated after business hours, the bomb did not injure anyone, but caused $18,000 in damage, destroying many of the exhibits. The room was sealed off and left unrepaired until the Statue of Liberty restoration project that began years later. FBI investigators believed the perpetrators were Croatian seeking media coverage of living conditions of Croats in Yugoslavia, though no arrests were made.
- July 22, 1980: Ali Akbar Tabatabai, an Iranian exile and critic of Ayatollah Khomeni, was shot in his Bethesda, Maryland home. Dawud Salahuddin, an American Muslim convert, was apparently paid by Iranians to kill Tabatabai.
- December 7, 1981: James W. von Brunn served 6 years in prison for attempting to kidnap members of the Federal Reserve at their headquarters in Washington, D.C. He testified his motive was to raise awareness of alleged "treacherous and unconstitutional" acts by the Federal Reserve.
- January 28, 1982: Kemal Arikan, the Turkish Consul-General in Los Angeles, was killed by members of the Justice Commandos Against Armenian Genocide.
- May 4, 1982: Turkish Honorary Consul Orhan Gunduz was assassinated in his car in Somerville, Massachusetts by the Justice Commandos Against Armenian Genocide.
- November 7, 1983: U.S. Senate bombing. The Armed Resistance Unit, a militant leftist group, bombed the United States Capitol in response to the U.S. invasion of Grenada.
- 1984 Rajneeshee bioterror attack: In what is believed to be the first incident of bioterrorism in the United States the Rajneesh movement spreads salmonella in salad bars at 10 restaurants in The Dalles, Oregon, to influence a local election which backfired as suspicious residents came out in droves to prevent the election of Rajneeshee candidates. Health officials say that 751 people were sickened and more than 40 hospitalized. All but one of the establishments attacked went out of business. Investigators believed that similar attacks had previously been carried out in Salem, Portland and other cities in Oregon.
- June 18, 1984: Alan Berg, Jewish lawyer-talk show host was shot and killed in the driveway of his home on Capitol Hill, Denver, Colorado, by members of a White Nationalist group called The Order. Berg had stridently argued with a member of the group on the show earlier who was convicted in his murder.
- October 11, 1985: Alex Odeh, a prominent Arab-American, was killed by a bomb in his office in Santa Ana, California. The case is unsolved, but it is thought the Jewish Defense League was responsible.
- December 11, 1985: computer rental store owner, Hugh Scrutton, was the first fatality of the Unabomber's neo-luddite campaign.
- March 1, 1989: 1989 firebombing of the Riverdale Press. The Riverdale Press, a weekly newspaper in the Bronx, New York, was firebombed one week after publishing an editorial defending author Salman Rushdie's right to publish The Satanic Verses, which questioned the founding story of Islam.
- November 17, 1989: 1989 Harlem Nights movie theater shooting. Detroit suburban theater shooting that occurred simultaneous to a shooting scene in the film. Two men were shot and killed inside AMC Americana 8 theater in the Detroit suburb of Southfield, Michigan. Less than an hour after the shooting, police arrived and found a 24-year-old Detroit man who had shot at an officer. The gunman was wounded when the officer shot him back in the theatre parking lot. The incident caused the theatre chain to cancel showings of Harlem Nights.
Oklahoma City bombing aftermath on April 26, 1995
- November 5, 1990: El Sayyid Nosair, a member of an Islamist terror cell led by Sheik Omar Abdul-Rahman, disguises himself as an orthodox Jew in order to assassinate politician and Rabbi Meir Kahane by shooting him at point-blank range. Nosair is acquitted of Kahane's murder, but convicted of other crimes. In prison, Nosair admits to Kahane's murder.
- January 25, 1993: CIA Shooting — Pakistani Mir Qazi (a/k/a Mir Aimal Kansi), outraged by U.S. policy toward Palestinians, opens fire on cars stopped at a traffic signal outside CIA Headquarters in Langley, Virginia. He kills 2 and injures 3, then escapes to Pakistan. He is subsequently apprehended, confesses, is tried and executed.
- February 26, 1993: World Trade Center bombing — Ramzi Yousef, a member of Al Qaeda, masterminds the truck-bombing of the World Trade Center. The bomb is meant to destabilize the foundation of the building, causing it to collapse and destroy surrounding buildings, leading to mass casualties. It failed to do so, but the detonation killed 6 people and injured more than 1000.
- March 10, 1993: Murder of David Gunn — Army of God (United States) member Michael F. Griffin ambushes and shoots gynecologist David Gunn three times in the back outside the Pensacola Women's Medical Services clinic. Before murdering Gunn, Griffin shouts, "Don't kill any more babies!"
- March 1, 1994: Brooklyn Bridge Shooting — Lebanese-born Rashid Baz ambushes and shoots up a van full of Jewish students returning from a visit with Rabbi Menachem M. Schneerson. One student dies, 3 are injured.
- July 29, 1994: Army of God (United States) member Rev. Paul Jennings Hill murders gynecologist John Britton and Britton's bodyguard James Barrett with a shotgun at close range, outside the Ladies Center clinic in Pensacola, Florida. Hill admits to the murder, is tried, convicted, and executed by lethal injection.
- December 10, 1994: Advertising executive Thomas J. Mosser is killed by a mail bomb sent by Unabomber. Mosser is the second person murdered by Kaczynski.
- December 30, 1994: Anti-abortion activist John C. Salvi III shoots and kills 2 employees and injures 5 others in a rampage attack at a Planned Parenthood clinic in Brookline, Massachusetts. Salvi escapes and drives to Norfolk, Virginia, where Army of God (United States) spokesman Rev. Donald Spitz resides.
- December 31, 1994: Salvi attacks the Planned Parenthood clinic in Norfolk, Virginia. A security guard returns fire and Salvi flees. Salvi is apprehended shortly after, and has in his possession Army of God (United States) spokesman Donald Spitz's name and unlisted telephone number.
- April 19, 1995: Oklahoma City bombing — Timothy McVeigh parks a truck bomb in front of the Alfred P. Murrah Federal Building in downtown Oklahoma City which explodes killing 168 people, including 19 children. McVeigh and Terry Nichols are convicted in the bombing, motivated by their outrage over the FBI's handling of the Waco Siege.
- April 24, 1995: Timber industry lobbyist Gilbert P. Murray, is killed in the third and final mailbomb attack by the Unabomber.
- July 27, 1996: In the Centennial Olympic Park bombing, Army of God member Eric Robert Rudolph places a three pipe bombs in a backpack, which he leaves in busy Centennial Olympic Park. The bomb is discovered by security guard Richard Jewell who raises an alert. One person is killed and 111 others are wounded in the explosion. Rudolph escapes and becomes a fugitive for 10 years. Rudolph's bomb is intended to force the cancellation of the Atlanta Olympics due to his outrage over legal abortion.
- January 16, 1997: Army of God member Eric Robert Rudolph bombs a women's health clinic in Sandy Springs, Georgia. There are two bombs; the first meant to kill people inside the clinic, the second bomb placed in the parking lot and time-delayed to kill first-responders. No one was harmed by the first bomb, but six people were injured by the second.
- February 21, 1997: Army of God member Eric Robert Rudolph bombs the Otherside Lounge, a gay bar in Atlanta, Georgia. There are two bombs; the first left on the outdoor patio, the second bomb left in the parking lot, time-delayed to kill first-responders. The initial explosion injures five, the second bomb is discovered and disposed of by the police bomb squad. Rudolph's motive for this bombing was his outrage over the existence of homosexuality.
- February 24, 1997: Palestinian Ali Hassan Abu Kamal, opens fire on tourists from an observation deck atop the Empire State Building. He shoots 7 people, killing 1. He then kills himself. A handwritten note carried by the gunman claims this was a punishment attack against the "enemies of Palestine".
- January 29, 1998: Army of God (United States) member Eric Robert Rudolph bombs a women's clinic in Birmingham, Alabama, killing 1 and critically injuring another.
- June 18, 1999: Brothers Matthew and Tyler Williams, inspired by the Christian Identity movement and anti-Semitic literature, set fires to Congregation B'nai Israel, Congregation Beth Shalom, and Knesset Israel Torah Center in Sacramento, California. The fires cause more than $1 million in damage.
- July 1, 1999: The Williams brothers murder gay couple Gary Matson and Winfield Mowder in Happy Valley, California.
- July 2, 1999: The Williams brothers set fire to the Country Club Medical Building in Sacramento County, California, which houses an abortion clinic.
- July 2–4, 1999: Neo-Nazi World Church of the Creator member Benjamin Nathaniel Smith goes on a two-state shooting spree in Indiana and Illinois. Starting on July 2, Smith wounds nine Orthodox Jews in drive-by shootings in Chicago. Smith then shoots and kills former college basketball coach Ricky Byrdsong, an African-American man, in Skokie, Illinois. On July 3, Smith travels to Decatur, where he wounds an African-American minister. On July 4, he kills Won-Joon Yoon, a 26-year-old Korean graduate student, in Bloomington, Indiana. Along his route, he shoots at and misses another nine people. He kills himself in a chase with police on July 4.
- August 10, 1999: In the Los Angeles Jewish Community Center shooting, white supremacist Buford O. Furrow Jr., armed with an Uzi-type sub-machine gun, walks into the lobby of the North Valley Jewish Community Center in Granada Hills, California and begins spraying bullets, wounding five. Furrow then flees, later killing Filipino-American postal worker Joseph Ileto for being a minority and a federal employee. Furrow surrendered himself to the FBI, and pleaded guilty to avoid the death penalty.
- December 31, 1999: Four members of the Earth Liberation Front start a fire in Michigan State University's Agriculture Hall causing $1 million in damage.
- October 10, 2000: 2000 New York terror attack. Three young men of Arab descent hurled crude Molotov cocktails at a synagogue in The Bronx, New York to "strike a blow in the Middle East conflict between Israel and Palestine".
- October 13, 2000: Firebombing of Temple Beth El (Syracuse)
- May 21, 2001: The Center for Urban Horticulture at the University of Washington burned by the Earth Liberation Front. Replacement building cost $7 million ($9,371,000 today). Earth Liberation Front members pled guilty.
- September 11, 2001: The September 11 attacks were carried out against the United States by the Al Qaeda Network, killing 2,507 civilians, 343 firefighters, 72 law enforcement officers, 55 military personnel, and 19 perpetrators. Four domestic commercial airliners were hijacked simultaneously while flying within the Northeastern United States; two flew directly into the Twin Towers of the World Trade Center in New York City, the third into the Pentagon in Arlington County, Virginia, and the fourth (thanks to the revolt by the passengers and crew members) into a field near Shanksville, Pennsylvania, during a failed attempt to destroy its intended target in Washington, D.C., either the White House or the United States Capitol. The Twin Towers were ultimately destroyed, and the Pentagon received extensive damage in the western side of the building. Building 7 of the World Trade Center was also destroyed in the attack, though there were no casualties.
- September 18 - November, 2001: 2001 anthrax attacks. Letters tainted with anthrax killed five across the U.S., with politicians and media officials as the apparent targets. On July 31, 2008, Bruce E. Ivins a top biodefense researcher committed suicide. On August 6, 2008, the FBI concluded that Ivins was solely responsible for the attacks, and suggested that Ivins wanted to bolster support for a vaccine he helped create and that he targeted two lawmakers because they were Catholics who held pro-choice views. However, subsequent evaluations have found that the FBI's investigation failed to provide any direct evidence linking Ivins to the mailings.
- July 4, 2002: 2002 Los Angeles Airport shooting Hesham Mohamed Hadayet, a 41-year-old Egyptian national, killed two Israelis and wounds four others at the El Al ticket counter at Los Angeles International Airport. The FBI concluded this was terrorism, though they did not find evidence linking Hadayet to a terrorist group.
- October 2002 Beltway sniper attacks: During three weeks in October 2002, John Allen Muhammad and Lee Boyd Malvo killed 10 people and critically injured 3 others in Washington D.C., Baltimore, and Virginia. The pair were also suspected of earlier shootings in Maryland, Alabama, Arizona, Georgia, Louisiana, and Washington state. No motivation was given at the trial, but evidence presented showed an affinity to the cause of the Islamic jihad.
- March 5, 2006: Mohammed Reza Taheri-azar injured 6 when he drove an SUV into a group of pedestrians at UNC-Chapel Hill to "avenge the deaths or murders of Muslims around the world".
- March 25, 2006: Capitol Hill massacre: Kyle Aaron Huff entered a rave afterparty in the southeast part of Seattle's Capitol Hill neighborhood and opened fire, killing six and wounding two. He then killed himself as he was being confronted by police on the front porch of 2112 E. Republican Street.
- July 28, 2006: Seattle Jewish Federation shooting, Naveed Afzal Haq, an American citizen of Pakistani descent, killed one woman and shoots five others at the Jewish Federation building in Seattle. During the shooting, Haq told a 911 dispatcher that he was angry with American foreign policy in the Middle East.
- October 26, 2007: A pair of improvised explosive devices were thrown at the Mexican Consulate in New York City. The fake grenades were filled with black powder, and detonated by fuses, causing very minor damage. Police were investigating the connection between this and a similar attack against the British Consulate in New York in 2005.
- March 3, 2008: Four luxury woodland houses near Woodinville, Washington were torched, leaving behind a message crediting the Earth Liberation Front.
- March 6, 2008: Times Square bombing. A homemade bomb damaged an Armed Forces Recruiting Office in Times Square. In June 2013, The FBI and New York City police offered a $65,000 reward for information in the case and revealed that ammunition used for the bomb is the same as is used in the Iraq and Afghanistan war zones. On April 15, 2015, the F.B.I increased the award to $115,000 and said they have persons of interest
- May 4, 2008: Multiple pipe bombs exploded at 1:40 am at the Edward J. Schwartz United States Courthouse in San Diego causing "considerable damage" to the entrance and lobby and sending shrapnel two blocks away, but causing no injuries. The FBI is investigating links between this attack and an April 25 explosion at the FedEx building also in San Diego.
- April 8, 2009: According to a report in the Wall Street Journal, intruders left malware in power grids, water, and sewage systems that could be activated at a later date. While the attacks which have occurred over a period of time seem to have originated in China and Russia, it is unknown if they are state-sponsored or errors in the computer code.
- May 31, 2009: Assassination of George Tiller: Scott Roeder shoots and kills Dr. George Tiller in a Wichita, Kansas church. Roeder, an anti-abortion extremist who believes in justifiable homicide of abortion providers, was arrested soon afterward. Roeder was convicted of the crime and sentenced to 50 years in prison in 2010. Tiller, who performed late-term abortions, had long been a target of anti-abortion extremists; his clinic was firebombed in 1986 and Tiller was shot and wounded five times in 1993 in a shooting attack by Shelley Shannon.
- May 25, 2009: 17-year-old Kyle Shaw sets off a crude explosive device at a Starbucks at East 92nd Street on the Upper East Side of Manhattan, shattering windows and destroyed a bench at the coffee shop. There were no injuries. The attack was a "bizarre tribute" of the movie Fight Club, in an attempt to emulate "Project Mayhem", a series of assaults on corporate America portrayed in the film. Shaw took a plea agreement and was sentenced to 3.5 years in prison in November 2010.
- June 1, 2009: Arkansas recruiting office shooting: Abdulhakim Mujahid Muhammad shot and killed one military recruiter and seriously wounded another at a Little Rock, Arkansas Army/Navy Career Center in an act of Islamic extremism. Muhammad, a convert to Islam, had visited Yemen for sixteen months where he spent time in prison and became radicalized. Muhammad, said he was part of Al-Qaeda in the Arabian Peninsula and was upset over the U.S. Army's murder of Muslims in Iraq and Afghanistan, like the Kandahar massacre and the Abu Ghraib prison scandal.
- November 5, 2009: 2009 Fort Hood shooting: Nidal Malik Hasan, a US Army Major serving as a Psychiatrist, opens fire at Fort Hood, Texas, killing 13 and wounding 29. On August 23, 2013 Hasan was convicted by a Military tribunal. Hasan acted as his own attorney and took responsibility for the attack saying his motive was jihad to fight "illegal and immoral aggression against Muslims". On August 28 Hasan was sentenced to death.
Boston Marathon bombings on April 15, 2013
- February 18, 2010: Austin suicide attack: Andrew Joseph Stack III flying his single engine plane flew into the Austin Texas IRS building killing himself and one IRS employee and injuring 13 others. Stack left a suicide note online, comparing the IRS to Big Brother from the novel 1984.
- March 4, 2010: 2010 Pentagon shooting: John Patrick Bedell shot and wounded two Pentagon police officers at a security checkpoint in the Pentagon station of the Washington Metro rapid transit system in Arlington County, Virginia.
- September 1, 2010: Discovery Communications headquarters hostage crisis: James J. Lee, armed with two starter pistols and an explosive device, takes three people hostage in the lobby of the Discovery Communications headquarters in Silver Spring, Maryland before being killed by police. After nearly four hours, Lee was shot dead by police and all the hostages were freed without injury. Lee had earlier posted a manifesto railing against population growth and immigration.
- August 5, 2012: Wisconsin Sikh temple shooting: Six people were killed and three others were injured, including a police officer who was tending to victims at a Sikh temple in Oak Creek, Wisconsin. The gunman, 40-year-old Wade Michael Page, killed himself after being shot by police. The shooting is being treated by authorities as an act of domestic terrorism. While a motive has not been clearly defined, Page had been active in white supremacist groups.
- April 15, 2013: Boston Marathon bombing: Two bombs detonated within seconds of each other near the finish line of the Boston Marathon, killing 3 and injuring more than 180 people. Late in the evening of April 18 in Cambridge, Massachusetts, an MIT campus police officer was shot and killed while sitting in his squad car. Two suspects then carjacked an SUV and fled to nearby Watertown, Massachusetts, a suburb of Boston. A massive police chase ensued, resulting in a shootout during which several IED's were thrown by the suspects. A Boston transit police officer was critically wounded and suspect Tamerlan Tsarnaev, a Russian immigrant of Chechen ethnicity, was killed. The second suspect, Tsarnaev's younger brother Dzhokhar Tsarnaev, escaped. A "Shelter in place" order was given for Boston, Watertown, and the surrounding areas while house-to-house searches were conducted, but the suspect remained at large. Shortly after the search was called off Tsarnaev was discovered by a local resident hiding inside a boat parked in the resident's driveway less than three blocks from the scene of the shootout. He was taken into custody after another exchange of gunfire and taken to nearby Beth Israel Deaconess Medical Center in Boston, where he was treated for injuries received during his pursuit and capture. Tsarnaev was arraigned on federal terrorism charges from his hospital bed on April 22, 2013. Preliminary questioning indicated the Tsarnaev brothers had no ties to terrorist organizations. A note written by Dzhokhar Tsarnaev on the boat where he was captured said the bombings were retaliation for US actions in Iraq and Afghanistan against Muslims. On April 8, 2015, Dzhokhar Tsarnaev was found guilty on all 30 counts related to the bombing and shootout with police. On May 15, 2015, Tsarnaev was sentenced to death.
- April 16, 2013: April 2013 ricin letters: Two letters, sent to Mississippi Republican Senator Roger Wicker and president Barack Obama, were tested positive for ricin. Each letter contained the message "I am KC and I approve this message". On April 27, 2013, a man named Everett Dutschke was arrested.
- November 1, 2013: 2013 Los Angeles International Airport shooting: Paul Anthony Ciancia entered the checkpoint at the Los Angeles International Airport and fired his rifle, killing one Transportation Security Administration officer and injuring six others. The motivation behind the attack was Paul's inspiration of the anti-government agenda, such as believing in the New World Order conspiracy theory, and stating that he "wanted to kill TSA" and described them as "pigs".
- December 13, 2013: 2013 Wichita bomb attempt: 58-year-old avionics technician, identified as Terry Lee Loewen, was arrested on December 13, 2013, for attempting a suicide bombing at Wichita Mid-Continent Airport, where he was employed. Loewen became radicalized after reading extremist Islamic material on the Internet. He was arrested while driving a vehicle into the airport with what he believed to be an active explosive device. Later sentenced to 20 years in Federal prison.
- April 13, 2014: Overland Park Jewish Community Center shooting: A pair of shootings committed by a lone gunman occurred at the Jewish Community Center of Greater Kansas City and Village Shalom, a Jewish retirement community, in Overland Park, Kansas. A total of three people died in the shootings. One suspect, identified as Frazier Glenn Miller, Jr., a neo-Nazi neo-Pagan, was arrested and charged with capital murder, first-degree murder, attempted first-degree murder, and aggravated assault.
- June 8, 2014: 2014 Las Vegas shootings: Two police officers and one civilian died in a shooting spree in the Las Vegas Valley committed by a couple, identified as Jerad and Amanda Miller, who espoused anti-government views and were reportedly inspired by the outcome of the Bundy standoff. The Millers both died during a gunfight with responding police; Jerad Miller was fatally shot by officers, while Amanda Miller committed suicide after being wounded.
- October 23, 2014: 2014 New York City hatchet attack: Zale Thompson injured two New York City Police Department (NYPD) officers, once critically at a Queens, New York City shopping district by striking them with a hatchet. Four officers were posing for a photograph when Thompson charged them. The police opened fire killing Thompson and injuring a civilian. Thompson who converted to Islam 2 years before the attack posted "anti-government, anti-Western, anti-white" messages online.
- December 2014: "The Guardians of Peace" linked by the United States to North Korea launched a cyber attack against SONY pictures. Embarrassing private emails were published and the organization threatened attacks against theaters that showed The Interview, a satire which depicted the assassination of North Korean leader Kim Jong Un. Following the refusal of theater chains to show the movie, SONY Pictures withdrew release of the movie, a decision that was criticized by President Obama and others. Obama said the USA will respond. North Korea denied responsibility for the attack and proposed a joint investigation with the U.S.
- December 20, 2014: Ismaaiyl Brinsley killed two New York City police officers, Rafael Ramos and Wenjian Liu in the Bedford Stuyvesant section of Brooklyn. Brinsley was reported to have walked up and fired directly into the officers squad car. Other officers chased the suspect into a nearby subway station, where he committed suicide. Prior to the shooting, Brinsley had written Instagram messages calling for revenge attacks in response to the police killings of Eric Garner and Michael Brown. He also allegedly shot his girlfriend in Maryland earlier that day.
- May 3, 2015: Curtis Culwell Center attack: Two gunmen opened fire outside the Curtis Culwell Center during an art exhibit hosted by an anti-Muslim group called the American Freedom Defense Initiative in Garland, Texas. The center was hosting a contest for cartoons depicting the Muslim prophet Muhammad. Both gunmen were killed by police. A Garland Independent School District (ISD) police officer was injured by a shot to the ankle but survived. The attackers, Elton Simpson and Nadir Soofi, were motivated by the Charlie Hebdo shooting in France and the 2015 Copenhagen shooting in Denmark earlier in the year. The Islamic State of Iraq and the Levant claimed responsibility for the attack through a Twitter post.
- June 17, 2015: Charleston church shooting: a mass shooting took place at Emanuel African Methodist Episcopal Church in downtown Charleston, South Carolina. The church is one of the United States' oldest black churches and has long been a site for community organization around civil rights. Nine people were killed, including the senior pastor, Clementa C. Pinckney, a state senator. A tenth victim was also shot, but survived. 21-year old Dylann Roof was arrested and later confessed that he committed the shooting in order to initiate a race war.
- July 16, 2015: 2015 Chattanooga shootings: Muhammad Youssef Abdulazeez opened fire on two military installations in Chattanooga, Tennessee. He first committed a drive-by shooting at a recruiting center, then traveled to a naval reserve center and continued firing. He was killed by police in a gunfight. Four Marines were killed immediately, and another Marine, a Navy sailor, and a police officer were wounded; the sailor died from his injuries two days later. The motive of the shootings is currently under investigation.
- November 27, 2015: Colorado Springs Planned Parenthood shooting: Robert L. Dear, armed with an assault-style rifle opened fire at a Colorado Springs Planned Parenthood clinic. Two civilians and one police officer were killed, and four civilians and five police officers were wounded before the suspect surrendered. Dear told police "No more baby parts" after being taken into custody.
- December 2, 2015: 2015 San Bernardino attack: A mass shooting occurred at the Inland Regional Center in San Bernardino, California, with 14 dead and 22 injured. Two suspects, Rizwan Farook and Tashfeen Malik, fled in an SUV, but were later killed.
- June 12, 2016: 2016 Orlando nightclub shooting: 49 people were killed and 53 were injured in a terrorist attack at a gay nightclub in Orlando, Florida. The nightclub shooting is currently the deadliest mass shooting in modern United States history. The sole suspect behind the slaughter was identified as Omar Mateen, an American-born citizen with Afghan immigrant parents who was later killed. The FBI asserted his possible link to radical Islam. Mateen also may have been acting from homophobic intentions resulting from his own self-hatred, according to several men who claim Mateen was gay. These men say they had seen him at the club and on gay dating sites such as Grindr. However, the FBI could not find evidence to suggest Mateen was gay or targeted Pulse because it was a gay club, according to The Washington Post 
- September 17–19, 2016: 2016 New York and New Jersey bombings: Four bombings or bombing attempts occurred in the New York metropolitan area, specifically in Seaside Park, New Jersey; Manhattan, New York; and Elizabeth, New Jersey. Thirty-one civilians were injured in one of the bombings. Ahmad Khan Rahami was identified as a suspect in all of the incidents and apprehended on September 19 in Linden, New Jersey, after a shootout that injured three police officers. According to authorities, Rahami was not part of a terrorist cell, but was motivated and inspired by the extremist Islamic ideology espoused by al-Qaeda founder Osama bin Laden and al-Qaeda chief propagandist Anwar al-Awlaki.
- November 28, 2016: 2016 Ohio State University attack: A car ramming attack and mass stabbing occurred at 9:52 a.m. EST at Ohio State University (OSU)'s Watts Hall in Columbus, Ohio. The attacker, Somali refugee Abdul Razak Ali Artan, was shot and killed by the first responding OSU police officer, and 11 people were hospitalized for injuries. According to authorities, Artan was inspired by terrorist propaganda from the Islamic State and radical Muslim cleric Anwar al-Awlaki.
Attacks by type
Organized KKK violence
- 1865–77: Over 3,000 Freedmen and their Republican Party allies were killed by a combination of the Ku Klux Klan and well organized campaigns of violence by local whites in a campaign of terrorist violence that overthrew Reconstructionist governments in the south and reestablished segregation.
- October 22, 1868: James M. Hinds, Arkansas congressional representative, was assassinated by a member of the Ku Klux Klan in Little Rock
- November 10, 1898: In the Wilmington Insurrection of 1898, white supremacists overthrew the biracial Republican government of Wilmington, North Carolina, killing at least 22 African Americans, marking the beginning of the Jim Crow era in North Carolina.
- 1927: The Ku Klux Klan launched a wave of political terror in Alabama, attempting to undermine African American rights.
- December 25, 1951: Harry T. Moore state co-coordinator of the Florida NAACP and his wife were killed by dynamite bomb in his Mims, Florida home. Despite extensive FBI investigation no one was arrested but Orlando KKK suspected.
- June 12, 1963: NAACP organizer Medgar Evers was killed in front of his Mississippi home by member of the Ku Klux Klan.
- September 16, 1963: 16th Street Baptist Church bombing. A member of the Ku Klux Klan bombed a Church in Birmingham, Alabama, killing four girls.
- June 21, 1964: In the Mississippi civil rights worker murders, three civil rights workers were murdered in Philadelphia, Mississippi by the Ku Klux Klan.
- March 25, 1965: The Ku Klux Klan murdered Viola Liuzzo, a Southern-raised white mother of five who was visiting Alabama from her home in Detroit to attend a civil rights march. At the time of her murder, Liuzzo was transporting Civil Rights Marchers.
- January 10, 1966: Vernon Dahmer died in the firebombing of his own home in Mississippi at the hands of the Ku Klux Klan.
- November 3, 1979: Members of the Ku Klux Klan and the American Nazi Party fired on meeting of members of a Communist group who were trying to organize local African American workers in Greensboro, North Carolina, killing five. See Greensboro massacre.
- March 20, 1981: Michael Donald was randomly selected to be lynched by two Ku Klux Klan members near his Alabama home. He was beaten, had his throat slit, and was hanged.
Left-wing extremism and anti-government
- September 6, 1901: President William McKinley assassinated by Michigan born Russian-Polish anarchist, Leon Czolgosz, in Buffalo, New York.
- October 1, 1910: Los Angeles Times bombing. The Los Angeles Times building in Los Angeles was destroyed by dynamite, killing 21 workers. The bomb was apparently placed due to the paper's opposition to unionization of its employees; the McNamara brothers were found guilty.
- November 24, 1917: A bomb explodes in a Milwaukee police station, killing nine officers and a civilian. Anarchists were suspected.
- 1919 1919 United States anarchist bombings
- September 16, 1920: Wall Street bombing
- 1969-1987: Weather Underground, a radical socialist movement, committed dozens of bombings and other terrorist activities over this time period. List of Weatherman actions
- August 7, 1969: Twenty were injured by radical leftist Sam Melville in a bombing of the Marine Midland Building in New York City.
- September 18, 1969: The Federal Building in New York City was bombed by radical leftist Jane Alpert.
- October 7, 1969: Fifth floor of the Armed Forces Induction Center in New York City was devastated by explosion attributed to radical leftist Jane Alpert.
- November 12, 1969: A bomb was detonated in the Manhattan Criminal Court building in New York City. Jane Alpert, Sam Melville, and 3 other militant radical leftists were arrested hours later.
- 1971 - 1975: The New World Liberation Front was a radical left-wing group in the San Francisco area in the 70's who conducted multiple bombings in the Bay area over a 3-year period. They claim almost 50 successful bombings.
- March 1, 1971: The radical leftist group Weather Underground exploded a bomb in the United States Capitol to protest the U.S. invasion of Laos.
- June 13, 1974: The 29th floor of the Gulf Tower in Pittsburgh, Pennsylvania, was bombed with dynamite at 9:41 pm resulting in no injuries. The radical leftist group Weather Underground took credit, but no suspects have ever been identified.
- November 7, 1983: U.S. Senate bombing. The Armed Resistance Unit, a militant leftist group, bombed the United States Capitol in response to the U.S. invasion of Grenada.
- May 2002: Lucas John Helder rigged pipe bombs in private mailboxes to explode when the boxes were opened. He injured 6 people in Nebraska, Colorado, Texas, Illinois, and Iowa. His motivation was to garner media attention so that he could spread a message denouncing government control over daily lives and the illegality of marijuana, as well as promote astral projection.
- 1951: Wave of hate related terrorist attacks in Florida. Blacks dragged and beaten to death, 11 race related bombings, dynamiting of synagogues and a Jewish School in Miami and explosives found outside of Catholic Churches in Miami.
- 1988: Frazier Glenn Miller Jr. a Vietnam Veteran and who according to the Southern Poverty Law Center founded the Carolina Knights of the Ku Klux Klan in the early 1980s served three years in Federal penitentiary for trying to assassinate Morris Dees founder of the Southern Poverty Law Center. The FBI found a cache of weapons in his home after they used tear gas to drive him out and arrest him. He testified against 14 White Supremacists as part of a plea bargain deal.
- January 17, 2011: 2011 Spokane bombing attempt
- August 5, 2012: Wisconsin Sikh temple shooting: Wade Michael Page killed six people at a Sikh temple in Oak Creek, Wisconsin before being killed by police officers. During the investigation of the crime, police found out that Page was a member of white supremacist and neo-Nazi organizations. With this evidence, the police concluded that racial hatred was the main cause of the murders.
- October 12, 1958: Bombing of the Hebrew Benevolent Congregation Temple of Atlanta, Georgia. The acts were carried out by white racists.
- June 18, 1984: Alan Berg, Jewish lawyer-talk show host was shot and killed in the driveway of his home on Capitol Hill, Denver, Colorado, by members of a White Nationalist group called The Order. Berg had stridently argued with a member of the group on the show earlier who was convicted in his murder.
- August 10, 1999: Los Angeles Jewish Community Center shooting in Granada Hills, California of Los Angeles. 5 people were wounded in the Jewish community center and its daycare facility. The gunman, Buford O. Furrow had antisemitic and anti-government views and was a member of a Neo-Nazi group The Order. Shortly thereafter, Furrow murdered a mail carrier, fled the state, and finally surrendered to authorities.
- June 10, 2009: United States Holocaust Memorial Museum shooting: 88-year-old James Wenneker von Brunn, a white supremacist and neo-Nazi, walked into the U.S. Holocaust Memorial Museum in Washington, D.C., shooting and mortally wounding Stephen Tyrone Johns, a security guard. Von Brunn was wounded when other museum guards immediately returned fire and on January 6, 2010, von Brunn died of natural causes at a hospital near where he was imprisoned awaiting trial. During the investigation it was discovered that von Brunn had planned to target White House senior adviser David Axelrod leading to increased protection for Axelrod and other steps.
- April 13, 2014 Overland Park Jewish Community Center shooting: 3 killed 1 critically injured in shootings at Jewish Community Center of Greater Kansas City and Village Shalom in Overland Park, Kansas. Suspect is 74-year-old Frazier Glenn Miller, Jr.. On April 27, 2015, Miller told the Associated Press he plans to plead guilty and his motivation was to "put the Jews on trial where they belong".
Puerto Rican nationalism
- March 1, 1954: United States Capitol shooting incident. Four Puerto Rican nationalists shoot and wound five members of the United States Congress during an immigration debate.
- October 14, 1969: The Fuerzas Armadas de Liberación Nacional (FALN), a Puerto Rican nationalist group, claims responsibility for a small bomb explosion at Macy's Herald Square
- January 24, 1975: FALN bombs Fraunces Tavern in New York City, killing four and injuring more than 50.
- December 29, 1975: A bomb set off by FALN in East Harlem, New York, permanently disables a police officer while causing him to lose an eye.
- August 3, 1977: FALN bombs exploded on the twenty-first floor of 342 Madison Avenue in New York City, which housed United States Department of Defense security personnel, as well as the Mobil Building at 150 East Forty-Second Street, killing one. In addition the group warned that bombs were located in thirteen other buildings, including the Empire State Building and the World Trade Center resulting in the evacuation of one hundred thousand people. Five days later a bomb attributed to the group was found in the AMEX building.
- May 3, 1979: FALN exploded a bomb outside of the Shubert Theatre in Chicago, injuring five people.
- March 15, 1980: Armed members of FALN raided the campaign headquarters of President Jimmy Carter in Chicago and the campaign headquarters of George H. W. Bush in New York City. Seven people in Chicago and ten people in New York were tied up as the offices were vandalized before the FALN members fled. A few days later, Carter delegates in Chicago received threatening letters from FALN.
- May 16, 1981: One was killed in an explosion in the toilets at the Pan Am terminal at New York's JFK airport. The bombing is claimed by the Puerto Rican Resistance Army.
- December 31, 1982: FALN explodes bombs outside of the 26 Federal Plaza in Manhattan, Federal Bureau of Investigation Headquarters and a United States courthouse in Brooklyn. Three New York Police Department police officers are blinded with one officer losing both eyes. All three officers sustained other serious injuries trying to defuse a second Federal Plaza bomb.
- June 5, 1968: Sirhan Sirhan, a Palestinian of Jordanian citizenship, assassinated Democratic presidential nominee, Robert F. Kennedy, in the Ambassador Hotel in Los Angeles, California, because of Kennedy's strong support of Israel. Some scholars believe the assassination was one of the first major incidents of political violence in the United States stemming from the Arab–Israeli conflict in the Middle East.
- March 4, 1973: A failed terrorist attack by Palestinian group Black September, with car bombings in New York City while Israeli Prime Minister Golda Meir was visiting the city
- June 1, 1973: Yosef Alon, the Israeli Air Force attache in Washington, D.C., was shot and killed outside his home in Chevy Chase, Maryland. Palestinian militant group Black September is suspected, though the case remains unsolved.
- July 1, 1973: Bethesda, MD, An Israeli diplomat is gunned down in his driveway by Palestinian activist.
- March 23, 1997 A Palestinian teacher Ali Hassan Abu Kamal leaves an anti-Jewish suicide note behind and travels to the top of the Empire State building where he shoot seven people in a Fedayeen attack
- October 22, 1970: An antipersonnel time bomb explodes outside a San Francisco church, showering steel shrapnel on mourners of a patrolman slain in a bank holdup; no one is injured. The Black Liberation Army is suspected.
- 1971: During this year the Black Liberation Army is suspected of killing three policemen one at his desk in San Francisco, shooting four others and opening fire on three patrol cars and rolling a grenade which heavily damages a police car and injures two officers. An attempt is made to bomb a police station. These incidents happen in various cities around the country. In August the group runs a one-month-long guerrilla warfare school in Fayetteville, Georgia. Seven are arrested in January 2007 in connection with the San Francisco desk shooting incident.
- January 22, 1972: Two New York City policemen, Gregory Foster and Rocco Laurie, are shot in the back by at least three persons; four suspects in the case are members of the Black Liberation Army; one suspect is later killed in a street battle with police; the recovered pistol matches Laurie's.
- December 28, 1972: A Brooklyn, New York bartender is held for $12000 ransom by the Black Liberation Army.
- January 7, 1973: After shooting a police officer a week earlier Mark Essex a former Black Panther party member shoots nineteen people, ten of them police officers, in retaliation for police killings in and around a Howard Johnson's hotel in New Orleans. He also set fires in the hotel before being killed by police.
- 1973: A New York City transit detective is killed and ten law enforcement personnel are shot four by machine gun during the year mostly in and around New York City by the Black Liberation Army. Also two members of that organization are arrested with a car full of explosives. In the next few years there are a number of violent incidents involving this organization but they are more criminal in nature.
- 2006 Sears Tower plot
- July 7, 2016 An Army veteran "upset about Black Lives Matter" and "recent police shootings" who opened fire Thursday night (July 7, 2016) in Dallas in an attack on police officers has been identified by police as Micah Xavier Johnson.
Right-wing extremism and anti-government
- April 19, 1995: Oklahoma City bombing: A truck bomb shattered the Alfred P. Murrah Federal Building in downtown Oklahoma City, killing 168 people. Right-wing terrorists Timothy McVeigh and Terry Nichols were convicted in the bombing.
- July 27, 1996: Centennial Olympic Park bombing by Eric Robert Rudolph occurred in Atlanta, Georgia, during the Atlanta Olympics. One person was killed and 111 injured. In a statement released in 2005 Rudolph said the motive was to protest abortion and the "global socialist" Olympic Movement.
- July 27, 2008: Knoxville Unitarian Universalist church shooting: Jim David Adkisson enters the Tennessee Valley Unitarian Universalist Church in Knoxville, Tennessee with a shotgun, killing two and injuring several congregants before being tackled to the ground. Adkisson stated to the police and in a manifesto that he desired to kill Democrats, liberals, African Americans and homosexuals. Adkisson pleaded guilty to the crime in February 2009 and was sentenced to life in prison without the possibility of parole.
- November 1, 2013 2013 Los Angeles International Airport shooting: 23-year-old Paul Ciancia kills a Transportation Security Administration agent and wounds 7 others, 3 of them TSA agents. Ciancia was shot and taken into custody. A note found in Ciancia's pocket said he believed he was a patriot and wanted to kill "patriot" upset at former Homeland Security Secretary Janet Napolitano, and that he wanted to kill "TSA and pigs".
- June 8, 2014 2014 Las Vegas shootings: Two Las Vegas police officers while eating pizza in a restaurant and one civilian were shot to death allegedly by Jerad and Amanda Miller a married couple in a suicide attack. A Gadsden flag, swastika and a note promising "revolution," was placed on the deceased officers bodies. The couple were thrown out a patriot group defending rancher Cliven Bundy. The Millers were both killed in a shootout with police on the same day.
- 1982: Three men identifying as the Army of God kidnapped Hector Zevallos (a doctor and clinic owner) and his wife, Rosalee Jean, holding them for eight days.
- 1983: Joseph Grace set the Hillcrest clinic in Norfolk, Virginia ablaze. He was arrested while sleeping in his van a few blocks from the clinic when an alert patrol officer noticed the smell of kerosene.
- 1984: Two men entered a Birmingham, Alabama clinic on Mother's Day weekend shortly after a lone woman opened the doors at 7:25 A.M. Forcing their way into the clinic, one of the men threatened the woman if she tried to prevent the attack while the other, wielding a sledgehammer, did between $7,500 and $8,500 of damage to suction equipment. The man who damaged the equipment was later identified as Father Edward Markley. Father Markley is a Benedictine priest who was the Birmingham diocesan "Coordinator for Pro-Life Activities". Markley was convicted of first-degree criminal mischief and second-degree burglary. His accomplice has never been identified. The following month (near Father's Day), Markley entered a women's health center in Huntsville, Alabama (see above).
- 1984: An abortion clinic and two physicians' offices in Pensacola, Florida, were bombed in the early morning of Christmas Day by a quartet of young people (Matt Goldsby, Jimmy Simmons, Kathy Simmons, Kaye Wiggins) who later called the bombings "a gift to Jesus on his birthday." The clinic, the Ladies Center, would later be the site of the murder of Dr. John Britton and James Barrett in 1994 and a firebombing in 2012.
- 1987: Eight members of the Bible Missionary Fellowship, a fundamentalist church in Santee, California, attempted to bomb the Alvarado Medical Center abortion clinic. Church member Cheryl Sullenger procured gunpowder, bomb materials, and a disguise for co-conspirator Eric Everett Svelmoe, who planted a gasoline bomb. It was placed at the premises but failed to detonate as the fuse was blown out by wind.
- 1989: A fire was started at the Feminist Health Center clinic in Concord NH on the day U.S. Supreme Court upheld a Missouri law banning funding of public facilities as related to abortion. The clinic was set afire again in 2000.
- 1993: Blue Mountain Clinic in Missoula, Montana; at around 1 a.m., an arsonist snuck onto the premises and firebombed the clinic. The perpetrator, a Washington man, was ultimately caught, convicted and imprisoned. The facility was a near-total loss, but all of the patients' records, though damaged, survived the fire in metal file cabinets.
- 1993: David Gunn was murdered by anti-abortion activist Michael F. Griffin
- 1994: Abortion provider John Britton and James Barrett (both killed) and his wife June (shot but not killed) became victims of Reverend Paul Jennings Hill.
- 1994: Two receptionists, Shannon Lowney and Lee Ann Nichols, were killed in two clinic attacks in Brookline, Massachusetts. 5 others critically injured. John Salvi was arrested and confessed to the killings. He died in prison and guards found his body under his bed with a plastic garbage bag tied around his head. Salvi had also confessed to a non-lethal attack in Norfolk, Virginia days before the Brookline killings.
- 1996–98: anti-abortion extremist Eric Rudolph cited biblical passages as his motivation for a series of bombings, including Atlanta's Olympic Centennial Park, a Lesbian bar, and several abortion clinics. Rudolph acknowledges his attacks were religiously motivated, but denies that his brief association with the racist Christian Identity movement was a motivation for his attacks.
- 1996: Dr. Calvin Jackson of New Orleans, Louisiana was stabbed 15 times, losing 4 pints of blood. Donald Cooper was charged with second degree attempted murder and was sentenced to 20 years. "Donald Cooper's Day of Violence", by Kara Lowentheil, Choice! Magazine, December 21, 2004
- 1997: Dr. David Gandell of Rochester, New York was injured by flying glass when a shot was fired through the window of his home by an anti-abortion Christian extremist.
- 1997: Eric Rudolph admitted, as part of a plea deal for the Centennial Olympic Park bombing at the 1996 Olympic Games to placing a pair of bombs that exploded at the Northside Family Planning Services clinic in the Atlanta suburb of Sandy Springs.
- 1998: Three people were seriously injured when acid was poured at the entrances of five abortion clinics in Miami, Florida.
- 1998: Robert Sanderson, an off-duty police officer who worked as a security guard at an abortion clinic in Birmingham, Alabama, was killed when his workplace was bombed. Eric Rudolph admitted responsibility; he was also charged with three Atlanta bombings: the 1997 bombing of an abortion center, the 1996 Centennial Olympic Park bombing, and another of a lesbian nightclub. He was charged with the crimes and received two life sentences as a result.
- 1998: Emily Lyons, a nurse, was severely injured, and lost an eye, in the Christian extremist "anti-abortion" bombing which also killed off-duty police officer Robert Sanderson.
- 1998: Dr. Barnett Slepian was shot to death with a high-powered rifle at his home in Amherst, New York. His was the last in a series of similar shootings against providers in Canada and northern New York State which were all likely committed by James Kopp. Kopp was convicted of Slepian's murder after being apprehended in France in 2001.
- 1998: James Kopp killed at least one and went on a series of anti-abortion shooting sprees, both in the U.S. and Canada.
- 1999: Martin Uphoff set fire to a Planned Parenthood clinic in Sioux Falls, South Dakota, causing US$100 worth of damage. He was later sentenced to 60 months in prison.
- 2000: An arson at a clinic in Concord, New Hampshire, resulted in several thousand dollars' worth of damage. The case remains unsolved. This was the second arson at the clinic.
- 2000: John Earl, a Catholic priest, drove his car into the Northern Illinois Health Clinic after learning that the FDA had approved the drug RU-486. He pulled out an ax before being forced to the ground by the owner of the building, who fired two warning shots from a shotgun.
- 2001: An unsolved bombing at a clinic in Tacoma, Washington, destroyed a wall, resulting in $6,000 in damages.
- 2005: A clinic Palm Beach, Florida, was the target of an arson. The case remains open.
- 2005: Patricia Hughes and Jeremy Dunahoe threw a Molotov cocktail at a clinic in Shreveport, Louisiana. The device missed the building and no damage was caused. In August 2006, Hughes was sentenced to six years in prison, and Dunahoe to one year. Hughes claimed the bomb was a "memorial lamp" for an abortion she had had there.
- 2006: David McMenemy of Rochester Hills, Michigan, crashed his car into the Edgerton Women's Care Center in Davenport, Iowa. He then doused the lobby in gasoline and started a fire. McMenemy committed these acts in the belief that the center was performing abortions; however, Edgerton is not an abortion clinic. Time magazine listed the incident in a "Top 10 Inept Terrorist Plots" list.
- 2007: A package left at a women's health clinic in Austin, Texas, contained an explosive device capable of inflicting serious injury or death. A bomb squad detonated the device after evacuating the building. Paul Ross Evans (who had a criminal record for armed robbery and theft) was found guilty of the crime.
- 2007: An unidentified person deliberately set fire to a Planned Parenthood clinic in Virginia Beach, Virginia.
- 2007: Chad Altman and Sergio Baca were arrested for the arson of Dr. Curtis Boyd's clinic in Albuquerque. Baca's girlfriend had scheduled an appointment for an abortion at the clinic.
- 2009: Matthew L. Derosia, 32, who was reported to have had a history of mental illness rammed an SUV into the front entrance of a Planned Parenthood clinic in St. Paul, Minnesota.
- 2009: Anti-abortion activist Scott Roeder killed George Tiller in Kansas.
- 2012: Bobby Joe Rogers, 41, firebombed the American Family Planning Clinic in Pensacola, Florida, with a Molotov cocktail; the fire gutted the building. Rogers told investigators that he was motivated to commit the crime by his opposition to abortion, and that what more directly prompted the act was seeing a patient enter the clinic during one of the frequent anti-abortion protests there. The clinic had previously been bombed at Christmas in 1984 and was the site of the murder of Dr. John Britton and James Barrett in 1994.
- 2012: A bomb exploded on the windowsill of a Planned Parenthood clinic in Grand Chute, Wisconsin, resulting in a fire that damaged one of the clinic's examination rooms. No injuries were reported.
- 2015: Robert Lewis Dear kills 3 people in a shooting at a Planned Parenthood Clinic. At his court hearings Dear declared himself a "warrior for the babies".
- April 14, 1972 1972 Harlem mosque incident, (New York, NY): Ten members of a local mosque phone in a false alarm and then ambush responding officers, killing one.
- 1973 - 1974 Zebra murders, (Oakland, CA): Series of attacks and murders by a radicalized group claiming affiliation to the Nation of Islam.
- March 9, 1977 1977 Hanafi Siege, (Washington, DC): Hanifi Muslims storm three buildings including a B'nai B'rith to hold 134 people hostage. At least two innocents were shot and one died.
- January 25, 1993 1993 shootings at CIA Headquarters, (Langley, VA): A Pakistani with Mujahideen ties guns down two CIA agents outside of the headquarters.
- February 26, 1993 1993 World Trade Center bombing, (New York, NY): Islamic terrorists detonate a massive truck bomb under the World Trade Center, killing six people and injuring over 1,000 in an effort to collapse the towers.
- March 1, 1994 1994 Brooklyn Bridge shooting, (Brooklyn, NY): A Muslim gunman targets a van packed with Jewish boys, killing a 16-year-old.
- March 23, 1997 1997 Empire State Building shooting (New York, NY): A Palestinian leaves an anti-Jewish suicide note behind and travels to the top of the Empire State building where he shoots seven people in a Fedayeen attack.
- September 11 attacks, 2001
- (New York, NY): Islamic hijackers steer two planes packed with fuel and passengers into the World Trade Center, killing hundreds on impact and eventually killing thousands when the towers collapsed. At least 200 are seriously injured.
- (Washington, DC): Nearly 200 people are killed when Islamic hijackers steer a plane full of people into the Pentagon.
- (Shanksville, PA): Forty passengers are killed after Islamic radicals hijack the plane in an attempt to steer it into the U.S. Capitol building.
- July 28, 2006 2006 Seattle Jewish Federation shooting, (Seattle, WA): An "angry" Muslim-American uses a young girl as hostage to enter a local Jewish center, where he shoots six women, one of whom dies.
- June 1, 2009, 2009 Little Rock recruiting office shooting, (Little Rock, AR): A Muslim shoots a local soldier to death inside a recruiting center explicitly in the name of Allah.
- November 5, 2009 2009 Fort Hood shooting, Ft. Hood, Texas: A Muslim psychiatrist guns down thirteen unarmed soldiers while yelling praises to Allah.
- September 11, 2011 2011 Waltham triple murder, (Waltham, MA): Three Jewish men have their throats slashed by Muslim terrorists.
- April 15, 2013 Boston Marathon bombing (Boston, MA): Foreign-born Muslims detonate two bombs packed with ball bearings at the Boston Marathon, killing three people and causing several more to lose limbs.
- September 25, 2014 Vaughan Foods beheading incident, (Moore, OK): A Sharia advocate beheads a woman after calling for Islamic terror and posting an Islamist beheading photo.
- July 16, 2015, 2015 Chattanooga shootings, Chattanooga, Tennessee: A Muslim commits a shooting spree at a recruiting center at a strip mall and a naval center, leaving five soldiers dead at the latter location.
- December 2, 2015, 2015 San Bernardino attack, San Bernardino, California: A Muslim couple opens fire at a Christmas party, leaving fourteen dead.
- June 12, 2016, 2016 Orlando nightclub shooting, Orlando, Florida: Omar Mateen shoots and kills 49 people and injures 53 more at a gay bar, the largest mass shooting in U.S. history.
This list includes all known terrorist attacks in the United States which have killed at least 10 people.
| 2001-09-11September 11, 2001
|| 2,996 (including 19 perpetrators)
|| September 11 attacks
|| New York City, New York, Arlington, Virginia, Shanksville, Pennsylvania|
| 1995-04-19April 19, 1995
|| Oklahoma City bombing
|| Oklahoma City, Oklahoma|
| 1857-09-07September 7–11, 1857
|| Mountain Meadows massacre
|| Mountain Meadows, Utah Territory|
| 2016-06-12June 12, 2016
|| 50 (including the perpetrator)
|| Orlando nightclub shooting
|| Orlando, Florida|
| 1921-05-31May 31, 1921
|| 39 officially, estimated 55-300
|| Tulsa race riot
|| Greenwood, Tulsa, Oklahoma|
| 1920-09-16September 16, 1920
|| Wall Street bombing
|| New York City, New York|
| 1910-10-01October 1, 1910
|| Los Angeles Times bombing
|| Los Angeles, California|
| 2015-12-02December 2, 2015
|| 16 (including 2 perpetrators)
|| San Bernardino attack
|| San Bernardino, California|
| 2009-11-05November 5, 2009
|| 33 (including the perpetrator)
|| Fort Hood shooting
|| Fort Hood, Texas|
| 1886-05-04May 4, 1886
|| Haymarket affair
|| Chicago, Illinois|
| 1975-12-29December 29, 1975
|| LaGuardia Airport bombing
|| New York City, New York|
| 1916-07-22July 22, 1916
|| Preparedness Day Bombing
|| San Francisco, California|
| 1917-11-24November 24, 1917
|| Milwaukee Police Department bombing
|| Milwaukee, Wisconsin|
| 2002-10-02October 2–22, 2002
|| Beltway Sniper attacks
|| Maryland, Virginia and Washington D.C.|
- November 25, 1864: Confederate Army of Manhattan Fires were set at 19 New York City hotels, P.T. Barnum's Museum, and 2 hay barges resulting in minor damage. Plot to burn down New York City organized by Confederate Lieutenant Colonel Robert Martin failed because the Greek fire incendiary devices were defective and the Lincoln Administration had been tipped off by a double agent and intercepted telegraph messages. After the conspirators found out the plot had been discovered they escaped to Canada. Confederate Captain Robert C. Kennedy became the only conspirator apprehended when he was arrested following his return to the U.S. Kennedy was tried by a military tribunal and hanged.
- September 16, 1920: The Wall Street bombing: A suspected attempt to kill financier J.P. Morgan by exploding the first car bomb. Bomb was created by putting scrap metal and 100 pounds of dynamite on a horse-drawn cart and blowing it up on Wall Street. Morgan was out of town but 38 people were killed. Responsibility for the attack has never been firmly established.
- June 1940: Two dynamite bombs were discovered outside of the Philadelphia Convention Hall during the Republican National Convention. A total of seven bombs were discovered in the greater Philadelphia area during this period.
- November 1, 1950: Assassination attempt on President Harry S. Truman by members of the Puerto Rican Nationalist Party at the Blair House in Washington, D.C.
- 1965 The Monumental Plot – New York Police thwart an attempt to dynamite the Statue of Liberty, Liberty Bell, and the Washington Monument by three members of the pro-Castro Black Liberation Front and a Quebec Separatist.
- March 6, 1970: Three members of the Weather Underground are killed when their "bomb factory" located in New York's Greenwich Village accidentally explodes. WUO members Theodore Gold, Diana Oughton, and Terry Robbins die in this accident. The bomb was intended to be planted at a non-commissioned officer's dance at Fort Dix, New Jersey. The bomb was packed with nails to inflict maximum casualties upon detonation. See Greenwich Village townhouse explosion.
- April 1971: Pipe bombs found at the embassies of Vietnam, Cambodia and Laos in Washington, D.C.
- 1972: Two Jewish Defense League members were arrested and charged with bomb possession and burglary in a conspiracy to blow up the Long Island residence of the Soviet mission to the United Nations
- March 7, 1972: 4.5 pounds of C-4 explosives found on a plane by New York City Police Bomb Squad.
- March 6, 1973: 1973 New York bomb plot Explosives found in the trunks of cars were defused at the El Al air terminal at Kennedy Airport, the First Israel Bank and Trust Company, and the Israel Discount Bank, in New York City. The plot was foiled when the National Security Agency intercepted an encrypted message sent to the Iraqi foreign ministry in Baghdad to the Palestine Liberation Organization's office. The attacks were meant to coincide with visit of Israeli Prime Minister Golda Meir. Khalid Duhham al-Jawary of the Black September was convicted on charges relating to the attacks in 1993 and was released to immigration authorities in 2009.
- September 22, 1975: Sarah Jane Moore tries to assassinate President Gerald Ford outside of the St. Francis Hotel in San Francisco. The attempt fails when a bystander grabs her arm and deflects the shot. Moore has stated the motive was to create chaos to bring "the winds of change" because the government had declared war on the left wing.
- 1984: According to Oregon law enforcement there was an abortive plot by the Rajneeshee cult to murder United States Attorney for Oregon, Charles Turner.
- April 1985: The FBI arrested several members of a Sikh terrorist group who were plotting to kill Indian PM Rajiv Gandhi when he visited New York in June.
- April 12, 1988: Yū Kikumura, a member of the Japanese Red Army, is arrested with three pipe bombs on the New Jersey Turnpike. According to prosecutors, Kikumura planned to bomb a military recruitment office in the Veteran's Administration building in lower Manhattan on April 14, the anniversary of the U.S. raid on Libya.
- June 1993: New York City landmark bomb plot. Followers of radical cleric Omar Abdel-Rahman were arrested while planning to bomb landmarks in New York City, including the UN headquarters.
- August 1994: Two right-wing extremists, Douglas Baker & Leroy Wheeler, both members of the Minnesota Patriots Council, are arrested for making ricin, a deadly toxin. The two will later be convicted of attempting to poison federal agents.
- March 1995: Charles Ray Polk is arrested while attempting to buy a quantity of plastic explosives and machine guns in order to assassinate four police officers and a female judge, and to use in a planned bombing of the IRS offices in Tyler, Texas.
- November 9, 1995: Willie Ray Lampley, a self-proclaimed Prophet, along with his wife Cecilia and a family friend John Dare Baird, were arrested for a plot to bomb numerous targets, including the Southern Poverty Law Center in Montgomery, Alabama, the Anti-Defamation League offices in Dallas and Houston, Texas, as well as a number of gay bars & abortion clinics.
- December 1995: Tax protesters Joseph Martin Bailie and Ellis Edward Hurst attempt to blow up the Internal Revenue Service building in Reno, Nevada with a 100-pound ANFO bomb.
- April 1996: Anti-government activist & survivalist Ray Hamblin is arrested after authorities find 460 pounds of the high explosive Tovex, 746 pounds of ANFO blasting agent, and 15 homemade hand grenades on his property in Hood River, Oregon during an investigation into a series of explosions in his storage sheds.
- July 1996: Twelve members of an Arizona militia group called the Viper Team are arrested on federal conspiracy, weapons and explosive charges after planning to bomb a number of Federal office buildings, including one that houses the office of the Bureau of Alcohol, Tobacco and Firearms and the FBI.
- July 1996: Washington State Militia leader John Pitner and seven others are arrested on weapons and explosives charges in connection with a plot to build pipe bombs for a confrontation with the federal government. Pitner and four others will be convicted on weapons charges, while conspiracy charges against all eight will end in a mistrial. Pitner will later be retried on that charge, convicted and sentenced to four years in prison.
- October 1996: Seven members of the Mountaineer Militia are arrested in a plot to blow up the FBI's national Criminal Justice Information Services Division in Clarksburg, West Virginia. In 1998, leader Floyd "Ray" Looker, will be sentenced to 18 years in prison.
- March 17, 1997: anti-abortion extremist Peter Howard puts 13 gas cans and three propane tanks in his truck, and drives it through the door of a California women's clinic in a failed attempt to fire bomb the clinic.
- September 1999: anti-abortion extremist Clayton Lee Waagner was pulled over by the Pennsylvania State Police, but fled into the woods and evaded capture, leaving behind a stolen car that contained firearms, explosives, fake ID, and a list of abortion clinics. Later in September 1999, while on a self-described "Mission from God", he took his wife and their nine children on a cross-country road trip headed west in a stolen Winnebago, planning to murder various abortion doctors, beginning with one in Seattle, Washington. However, after crossing into Illinois his vehicle broke down, and Waagner was arrested when Illinois State Police stopped to investigate. Waagner was convicted on charges of interstate transportation of a stolen motor vehicle and for being a convicted felon in possession of firearms. Waagner later escaped and used a cross country crime spree to continue to fund his anti-abortion mission.
- January 1, 2000: 2000 millennium attack plots, plan to bomb LAX Airport in Los Angeles
- December 5, 2001: anti-abortion extremist Clayton Lee Waagner is arrested in a Kinko's while he was preparing to fax bomb threats to a mass list of abortion clinics.
- December 12, 2001: Jewish Defense League plot by Chairman Irv Rubin and follower Earl Krugel to blow up the King Fahd Mosque in Culver City, California and the office of Lebanese-American Congressman Darrell Issa foiled.
- December 22, 2001: British citizen and self-proclaimed Al Qaeda member Richard Reid attempted to detonate the C-4 explosive PETN concealed in his shoes while on a flight from Paris to Miami. He was subdued by crew and passengers with the plane landing safely in Boston.
- 2004 financial buildings plot: Al-Qaeda plan to bomb the International Monetary Fund, New York Stock Exchange, Citigroup and Prudential buildings broken up after arrest of computer expert in Pakistan and plotters in Britain.
- 2004 Columbus Shopping Mall bombing plot: A loosely organized group of young men planned to carry out an attack on an unnamed shopping mall.
- September 11, 2006: A man rammed his car into a women's clinic that he thought was an abortion clinic and set it ablaze in Davenport, Iowa causing $20,000 worth of damage to the building.
- April 25, 2007: A bomb was left in a women's clinic in Austin, Texas but failed to explode.
- 2009 2009 New York bomb plot
- December 25, 2009: British and Nigerian citizen and self-described Al-Qaeda member Umar Farouk Abdulmutallab allegedly attempted to blow up Northwest Airlines Flight 253 in flight over Detroit by igniting his underpants which were filled with the C-4 explosive PETN. He has been indicted in a U.S. federal court; charges include the attempted murder of 289 people. Several days later, Al Qaeda's affiliate in Yemen and Saudi Arabia claimed responsibility for the attempted attack. Addressing America, the group threatened to "come for you to slaughter." On January 24, 2010 an audio tape that US intelligence believes is authentic was broadcast in which Osama bin Laden claimed responsibility for the attempted bombing. The intelligence officials expressed doubt about the veracity of bin Laden's claim. On October 12, 2011 Abdulmutallab pled guilty to all counts against him and read a statement to the court saying "I attempted to use an explosive device which in the U.S. law is a weapon of mass destruction, which I call a blessed weapon to save the lives of innocent Muslims, for U.S. use of weapons of mass destruction on Muslim populations in Afghanistan, Iraq, Yemen and beyond".
- May 1, 2010 2010 Times Square car bomb attempt and plot: An attempted evening car bombing in crowded Times Square in New York City failed when a street vendor saw smoke emanating from an SUV and called police. The White House has blamed Tehrik-e-Taliban the Pakistani Taliban for the failed attack and said Faisal Shahzad aged 30, an American of Pakistani origin who has been arrested in relation to the incident was working for the group. In July 2010, the Pakistani Taliban released a video featuring Shahzad in which he urged other Muslims in the West to follow his example and to wage similar attacks. On May 3, Shahzad was arrested at Kennedy Airport as he was preparing to fly to Dubai. The device was described as crude and amateurish but potent enough to cause casualties. On May 13 the F.B.I. raided several locations in the Northeast and arrested 3 on alleged immigration violations. Several suspects were arrested in Pakistan including the co-owner of a prominent catering firm used by the US embassy. On June 21 Shahzad pled guilty to 10 counts saying he created the bomb to force the US military to withdraw troops and stop drone attacks in a number of Muslim countries. Shahzad said he chose the location to cause mass civilian casualties because the civilians elected the government that carried out the allegedly anti Muslim policies. On October 4, 2010 Shahzad was sentenced to life in prison. During his sentencing, he threatened that "the defeat of the U.S. is imminent" and that "we will keep on terrorizing you until you leave our lands." Shahzad planned on detonating a second bomb in Times Square two weeks later.
- July 21, 2010: Bryon Williams captured after shootout with California Highway Patrol with guns strapped on his body armor alleged to have confessed that he was on his way to kill workers at the American Civil Liberties Union and follow it up with and attack on Tides Center allegedly was angry with left-wing politics and inspired by conspiracy theories of Glenn Beck and hoped the attack would ignite a revolution.
- January 17, 2011: Spokane bombing attempt: A small pipe bomb in a backpack designed to be detonated by remote control and spread shrapnel in a specific direction was discovered during a Martin Luther King Day parade in Spokane, Washington. White supremacist Kevin Harpham is convicted and sentenced to 32 years in federal prison.
- April 8, 2013: Letters believed to contain the poison Ricin were sent to President Barack Obama and Mississippi Republican Senator Roger Wicker and a Mississippi Justice official. Tests on the granular substance found in the letters tested positive for "low grade" ricin.
- April 25, 2013: Dzhokhar Tsarnaev, the suspect in the Boston Marathon bombing, told investigators that he and his brother discussed using leftover explosives to attack Times Square. According to NYC Police commissioner Raymond Kelly the plan was conceived after they attacked Boston and was foiled when their SUV ran out of gas as they tried to escape from the Boston marathon bombing manhunt.
- January 15, 2015: Washington, DC. U.S. Capitol Terror Attack Stopped By FBI. Investigators say a 20-year-old Ohio man now in FBI custody wanted to set off pipe bombs at the U.S. Capitol as a way of supporting ISIS. Federal authorities identified the man as Christopher Lee Cornell, also known as Raheel Mahrus Ubaydah. Cornell, who lives in the Cincinnati area, allegedly told an FBI informant they should "wage jihad," and showed his plans for bombing the Capitol and shooting people, according to a criminal complaint filed in federal court. The FBI said Cornell expressed his desire to support the Islamic State. Authorities say Cornell was arrested Wednesday after buying two semi-automatic rifles and about 600 rounds of ammunition, but an FBI agent says the public was never in danger.
- May 3, 2015: Garland, Texas. Elton Simpson and Nadir Soofi, roommates from North Phoenix, Arizona, were killed by a security guard when they started shooting at a building holding a Mohammad cartoon contest sponsored by Stop Islamization of America. A school security officer helping with security at the event was shot in the leg.
Alleged and proven plots
- November 1864: Plan by Confederate Lieutenant Colonel Robert Martin and the Copperheads organization Sons of Liberty to attack New York City and disrupt elections collapsed when the Sons of Liberty backed out upon seeing large numbers of Union troops.
- February 28, 1865 Dahlgren Affair: Alleged plot by Union General Judson Kilpatrick to burn down Richmond, Virginia and kill Confederate President Jefferson Davis and his Cabinet. Allegations based on papers recovered by a 13-year-old member of the Confederate home guard. The authenticity of the papers have been a matter of dispute.
- January 1940: The FBI shuts down the Christian Front after discovering its members were arming themselves for a plot to "murder Jews, communists, and 'a dozen Congressmen'" and establishing a government modeled after Nazi Germany.
- March 31, 1943: Clarence Cull arrested and charged with attempting to assassinate President Franklin D. Roosevelt by suicide bombing. Cull blamed Roosevelt for lost convoys of Merchant Ships.
- November 9, 1995: Oklahoma Constitutional Militia members arrested while in the planning stages for bombings of Southern Poverty Law Center, gay bars and abortion clinics.
- January 1, 1996: Members of the Viper Team militia are arrested after they caught surveying government buildings in Arizona.
- July 13, 1996: John J. Ford, 47, of Bellport, Long Island, a former court officer and president of the Long Island U.F.O. Network, and Joseph Mazzachelli plotted to poison local politicians with radium and shoot them if that did not work. They believed the government was covering up knowledge of UFO landings.
- November 11, 1996: Seven members of the Mountaineer Militia are arrested in a plot to blow up the FBI fingerprint records center in West Virginia.
- July 4, 1997: Members of the splinter militia group the Third Continental Congress are arrested while planning attacks on military bases which they believed were being used to train United Nations troops to attack U.S. citizens.
- July 30, 1997: Two men who were planning to bomb the New York City subway the next day arrested. A resident of their apartment informed police after he overheard the men discussing the plot.
- March 18, 1998: Members of the North American Militia are arrested in plot to bomb Federal Buildings in Michigan, a television station and an interstate highway intersection.
- December 5, 1999: Members of the San Joaquin Militia are arrested on charges of plotting to bomb critical infrastructure locations in hopes of sparking an insurrection. The leaders of the group pled guilty to charges of plotting to kill a Federal judge.
- December 8, 1999: The leader of the Southeastern States Alliance militia group is arrested in plot to bomb energy faculties with the goal of causing power outages in Florida and Georgia.
- March 9, 2000: The former leader of the Texas Militia is arrested in a plot to attack the Federal Building in Houston.
- February 8, 2002: Two members of Project 7 are arrested plotting to kill judges and law enforcement officials in order to kick off a revolution.
- May 8, 2002: José Padilla, accused by John Ashcroft of plotting to attack the United States with a dirty bomb, declared as an enemy combatant, and denied habeas corpus. No material evidence has been produced to support the allegation.
- July 26, 2002 2002 White supremacist terror plot: Two white supremacists were convicted of conspiring to start a race war by bombing landmarks associated with Jews and Blacks.
- September 3, 2002: An Idaho Mountain Militia Boys plot to kill a judge and a police officer and break a friend out of jail is uncovered.
- April 24, 2003: William Krar is charged for his part in the Tyler poison gas plot, a white supremacist related plan. A sodium cyanide bomb was seized with at least 100 other bombs, bomb components, machine guns, and 500,000 rounds of ammunition. He faces up to 10 years in prison.
- May 1, 2003: Iyman Faris pleads guilty to providing material support to al-Qaeda and plotting to bring down the Brooklyn Bridge by cutting through cables with blowtorches. He had been working as a double for the FBI since March, but in October was sentenced to 20 years in prison.
- August 31, 2005 2005 Los Angeles bomb plot: Kevin James, Hammad Samana, Gregory Patterson, and Levar Washington were indicted on charges to wage war against the U.S. government through terrorism in California. The men planned attacks against Jewish institutions and American military locations in Los Angeles during the Yom Kippur holiday.
- February 21, 2006: The Toledo terror plot where three men were accused of conspiring to wage a "holy war" against the United States, supply help to the terrorist in Iraq, and threatening to kill the US president.
- June 23, 2006: The Miami bomb plot to attack the Sears Tower where seven men were arrested after an FBI agent infiltrated a group while posing as an al-Qaeda member. No weapons or other materials were found. On May 12, 2009 after two mistrials due to hung juries five men were convicted and one acquitted on charges related to the plot. Narseal Batiste, the groups ringleader, was convicted on four charges, the only defendant to be convicted on all four charges brought against the defendants.
- July 7, 2006: Three suspects arrested in Lebanon for plotting to blow up a Hudson River tunnel and flood the New York financial district.
- November 29, 2006: Demetrius Van Crocker a white supremacist from rural Tennessee was sentenced to 30 years in prison for attempting to acquire Sarin nerve gas and C-4 explosives that he planned to use to destroy government buildings.
- December 8, 2006: Derrick Shareef, 22, a Muslim convert who talked about his desire to wage jihad against civilians was charged in a plot to set off four hand grenades in garbage cans December 22 at the Cherryvale Mall in Rockford, Illinois.
- March 5, 2007: A Rikers Island inmate offered to pay an undercover police officer posing as a hit man to behead New York City police commissioner Raymond Kelly and bomb police headquarters in retaliation for the controversial police shooting of Sean Bell. The suspect wanted the bombing to be considered a terrorist act.
- May 1, 2007: Five members of a self-styled Birmingham, Alabama area anti-immigration militia were arrested for planning a machine gun attack on Mexicans.
- May 7, 2007: Fort Dix attack plot. Six men inspired by Jihadist videos arrested in a failed homegrown terrorism plot to kill soldiers. Plot unravels when Circuit City clerk becomes suspicious of the DVDs the men had created and report it to authorities who place an informant in the group. In October 2008 one man pleaded guilty to charges related to the plot. On December 22, 2008 five other men were convicted with conspiracy to kill American soldiers but were acquitted of attempted murder. Dritan, Shain and Eljvir Duka were sentenced to life in prison.
- June 3, 2007: John F. Kennedy International Airport terror plot. Four men indicted in plot to blow up jet-fuel supply tanks at JFK Airport and a 40-mile (64 km) connecting pipeline. One suspect is a U.S. citizen and one, Abdul Kadir, a former member of parliament in Guyana. The airport was targeted because one of the suspects saw arms shipments and missiles being shipped to Israel from that locale. In a recorded conversation one of the suspects allegedly told an informant that "Anytime you hit Kennedy, it is the most hurtful thing to the United States. To hit John F. Kennedy, wow.... They love JFK – he's like the man". Plot unraveled when a person from law enforcement was recruited. On June 29, 2010 Abdel Nur pled guilty to material support charges. Due to health reasons Kareem Ibrahim was removed from the case and will be tried separately. On August 2 Russell M. Defreitas and Abdul Kadir were convicted for their role in the plot.
- March 26, 2008: Michael S. Gorbey who was detained in January 2008 for carrying a loaded shotgun two blocks from the Capitol Building has been charged planning to set off a bomb after a device containing can of gunpowder duct-taped to a box of shotgun shells and a bottle containing buckshot or BB pellets was found in the pickup truck he was driving. The pickup truck was moved to a government parking lot where for a three-week period the device inside it went unnoticed. Michael Gorbey gets 22 years prison, but he insisted that police planted weapons.
- October 27, 2008: Federal agents claim to thwarted a plot by two white power skinheads to target an African American High School and kill 88 blacks and decapitate 14 more (the numbers 88 and 14 are symbolic to white supremacists) and although expecting to fail try to assassinate Barack Obama.
- May 20, 2009: 2009 New York City bomb plot Three U.S. citizens and one Haitian from Newburgh, New York were arrested in a plot to bomb a Riverdale Temple and a Riverdale Jewish Center in The Bronx, New York City in an alleged homegrown terrorist plot. It was also alleged that they planned to shoot down military planes operating out of Stewart Air National Guard Base also in Newburgh. One of the suspects whose parents are from Afghanistan was said to be "unhappy that many Muslim people were being killed in Afghanistan and Pakistan by the United States Military forces." On October 18, 2010, the four were convicted on most of the charges brought against them. On June 29, 2011 three of the men were sentenced to 25 years imprisonment by a judge who criticized the governments handling of the case. A 2014 award-winning HBO documentary about the four, The Newburgh Sting, claimed that it was a clear case of entrapment and an egregious miscarriage of justice.
- September 2009 New York City Subway and United Kingdom plot: Najibullah Zazi of Denver was indicted on charges of trying to build and detonate a weapon of mass destruction by purchasing hydrogen peroxide, acetone and other chemicals. He and two others allegedly planned to detonate the homemade explosives on the New York City subway system. On February 22, 2010 Zazi pled guilty to conspiracy to use weapons of mass destruction, conspiracy to commit murder in a foreign country and providing material support for a terrorist organization. Zazi said he was recruited by al-Qaeda as part of a "martyrdom plan". Zazi agreed to cooperate with authorities and has told them that the groups planned to walk into the Times Square and Grand Central stations with backpack bombs at rush hour and then choose which subway lines to attack. Several days later Adis Medunjanin and Zarein Ahmedzay high school classmates of Zazi were indicted and pled not guilty to charges of conspiracy to use weapons of mass destruction, conspiracy to commit murder in a foreign country and providing material support for a terrorist organization. On April 12 a fourth man was arrested in Pakistan. On April 23 Prosecutors said that two Senior Al Queda officials who were reportedly later killed in drone attacks ordered the attacks and Zarein Ahmedzay pleaded guilty to plot related charges. On July 7 five others were indicted including al-Qaeda leader Adnan Shukrijumah, and it was alleged the United Kingdom was also a target of the plot. While in Pakistan, Zazi, Ahmedzay and Medunjanin were allegedly recruited and directed by Shukrijumah, a former Florida student who is designated as one of the FBI's most wanted terrorists, to conduct a terrorist attack in the U.S. On August 6 new charges were brought against Medunjanin and 4 others including Shukrijumah. Medunjanin pleaded not guilty.
- August – September 2009: On September 24, William Boyd and Hysen Sherifi charged with "conducting reconnaissance of the Marine Corps base at Quantico, Virginia and obtaining armor-piercing ammunition with the intent to attack Americans". Boyd, two of his sons and several other suspects had been charged on international terrorism charges in August, but at the time there was no indication that they wanted to plot a United States attack. An audio tape of Boyd decrying the U.S. military, discussing the honor of martyrdom, and bemoaning the struggle of Muslims was played at an August hearing. It is the first case of a ring of homegrown terrorists having specific targets.
- September 24, 2009: Michael Finton/Talib Islam a 29-year-old man from Illinois charged with trying to kill federal employees by detonating a car bomb at the federal building in Springfield, Illinois. Charges based on F.B.I. sting operation. He is said to idolize American-born Taliban soldier John Walker Lindh.
- September 24, 2009: Hosam Maher Husein Smadi a 19-year-old illegal immigrant from Jordan charged with trying the bomb the 60 story Fountain Place office tower in Dallas, Texas. Charges are based on F.B.I. sting operation in which agents posed as members of an al-Qaeda sleeper cell.
- January 7, 2010: Adis Medunjanin an alleged 2009 New York City Subway plotter attempts a suicide attack by intentionally crashing his car on the Whitestone Bridge in New York City. He is indicted for this on July 7. Medunjanin has since been charged for his role in an Al Qaeda plot to conduct coordinated suicide bombings on New York's subway system.
- May 2010: Paul Rockwood Jr. a meteorologist who took official weather observations and his pregnant wife Nancy from King Salmon, Alaska compiled a list of 20 targets, including members of the military and media and had moved to the operational phase of their plan pled guilty to lying to FBI about the list and making false statements to the FBI. Under a plea agreement Mr. Rockwood will serve eight years in prison and three years probation while Ms. Rockwood will serve probation. Motive was revenge for alleged descecration of Islam.
- September 20, 2010: Sami Samir Hassoun, 22, a Lebanese citizen living in Chicago, was charged with one count each of attempted use of a weapon of mass destruction and attempted use of an explosive device after placing a backpack with what he thought was a bomb near Wrigley Field. Alleged plot was foiled by FBI informant. Hassoun discussed other ideas for mass destruction attacks with informant.
- October 27, 2010: Farooque Ahmed, 34, a naturalized U.S. citizen indicted for conspiracy to bomb 4 Washington Metro stations with people he thought were al-Qaeda.
- November 26, 2010: Mohamed Osman Mohamud a 19-year-old Somali-American is alleged to have attempted a car bombing at a Christmas tree lighting ceremony in Portland, Oregon. The device was a dud created by the FBI. Motive is reported to be Jihad. On January 31, 2013 a jury found Mohamud guilty of the charge of trying to use a weapon of mass destruction.
- December 8, 2010: Antonio Martinez, also known as Muhammad Hussain arrested after a sting operation in an alleged plot to bomb a military recruiting center in Catonsville, Maryland. The 21-year-old suspect is an American who converted to Islam. The suspect was reported to be upset that the military continues to kill Muslims.
- December 21, 2010: Internet radio broadcaster Hal Turner sentenced to 33 months in prison after he published the work addresses and photographs of three judges who had upheld gun control laws and advocated for their assassination.
- February 24, 2011: Khalid Ali-M Aldawsari a 20-year-old Saudi Arabian student arrested for building bombs to use in alleged terrorist attacks. Targets allegedly were home of George W. Bush, hydroelectric dams, nuclear power plants, nightclubs and the homes of soldiers who were formerly stationed at the Abu Ghraib prison. In Aldawsari's journal he wrote he was inspired by the speeches of Osama bin Laden. Alleged plot uncovered when supplier noticed suspicious purchases.
- May 11, 2011: In the 2011 Manhattan terrorism plot, Ahmed Ferhani resident of Queens, New York and native of Algeria and Mohamed Mamdouh aged 20 also from Queens and Moroccan native arrested in a lone wolf plot against a New York Synagogue that had yet to be chosen. It also alleged that they hoped to attack the Empire State Building. The pair were arrested after buying two Browning semi-automatic pistols, one Smith & Wesson revolver, ammunition and one grenade. The pair disguised themselves as Jewish temple goers and pretended to pray. The suspects were said to be "committed to violent jihad".
- June 23, 2011: Abu Khalid Abdul-Latif and Walli Mujahidh of Long Beach, California are arrested on charges of buying machine guns and grenades and conspiring to attack a federal building housing a Military Entrance Processing Station in Seattle, Washington.Plot was uncovered by informent. Motive was to send message in protest of US action abroad. On April 8, 2013 Walli Mujahidh apologized and was sentenced to 17 years for his role in the plot.
- July 27, 2011: AWOL U.S. Army Private, and conscientious objector, Naser Jason Abdo from Garland, Texas was arrested in an alleged plot against Fort Hood, Texas. Materials for up to two bombs were found with jihadist materials in Abdo's motel room. Investigation began when owner of a local gun store called police after becoming suspicious when Abdo asked questions indicating he did not know about the items he was purchasing.
- September 28, 2011: Rezwan Ferdaus, a US citizen,was indicted for allegedly plotting to use remote-controlled aircraft carrying explosives to bomb the Pentagon and the US Capitol. He also allegedly planned to hire people to shoot at people fleeing the Pentagon. Ferdaus was said to be motivated by Al Queada videos and the alleged plot was uncovered by an F.B.I. sting operation. In July 2012 he pleaded guilty to plotting an attack on the Pentagon and U.S. Capitol and attempting to provide material support to terrorists. Under a plea bargain, he was sentenced to 17 years in prison and then 10 years of supervised release.
- October 11, 2011: Operation Red Coalition. Alleged plot that was "conceived, sponsored and was directed from Iran" to assassinate the Saudi Arabian ambassador to the United States Adel al-Jubeir with a bomb and bomb the Saudi and Israeli embassies in Washington, D.C. It is not known if Iranian Supreme Leader Ayatollah Ali Khamenei or President Mahmoud Ahmadinejad had knowledge of the plot. The alleged plot was disrupted by an FBI and DEA investigation. The investigation began in May 2011 when an Iranian-American approached a DEA informant seeking the help of a Mexican drug cartel to assassinate the Saudi ambassador. Iran has denied the allegations.
- October–November 2011: Georgia terrorist plot Four elderly men from a Georgia militia arrested for plotting to buy ricin in preparation for an attack they claimed would "save the Constitution". They allegedly discussed blowing up IRS and ATF buildings, dispensing ricin from a plane over Atlanta and other cities, and assassinating "un American" politicians. Informant used to break up alleged plot.
- November 20, 2011: Jose Pimentel, aged 27, an American citizen and a convert to Islam from New York City arrested and accused of being the process of building pipe bombs (and one hour away from his building his first bomb) to target post offices police cars and U.S. military personnel returning from abroad in New York City and Bayonne, New Jersey. Was said to be a follower of the late al-Qaeda leader Anwar al-Awlaki. The FBI did not consider Pimentel who was said to be radicalized via the internet by enough of a threat to investigate but NYC police considered him a 2 on a threat scale of 1 to 5.
- January 7, 2012: Sami Osmakac a naturalized American from Kosovo arrested in plot to create mayhem in Tampa, Florida by car bombing, hostage taking and exploding a suicide belt. Allege bomb targets included by night clubs in the Ybor City, a bar, and the operations center of the sheriff's office and South Tampa businesses. Osmakac allegedly told an FBI undercover agent "We all have to die, so why not die the Islamic way?". Osmakac pled not guilty on February 8.
- 2012 February 17: Amine El Khalifi a Moroccan man from Alexandria, Virginia arrested in alleged suicide bombing plot of U.S. Capital. Was arrested was a result of F.B.I. sting operation. As a result of a plea agreement El Khalifi was sentenced to 30 years in prison on September 14.
- May 1, 2012: 5 self described anarchists were arrested in an alleged plot to blow up a bridge in Cuyahoga Valley National Park in Brecksville, Ohio. The group was being monitored as part of an F.B.I. undercover operation and had considered other plots previously. One of the suspects expressed a desire to cause financial damage to companies while avoiding casualties.
- August 27, 2012: Four non-commissioned officers from Fort Stewart in Georgia, along with five other men, were charged in an alleged plot to poison an apple orchard and blow up a dam in Washington State, seize control of Fort Stewart, set off explosives in a park in Savannah, Georgia, and assassinate President Barack Obama. The alleged plot was on behalf of the "FEAR" militia for the long term purpose of overthrowing the government.
- 2012 October 17: Mohammad Rezwanul Ahsan Nafis age 21 arrested in plot to bomb the Manhattan office of the Federal Reserve Bank on behalf of "our beloved Sheikh Osama bin Laden". Motive was to destroy the economy and possibly force cancellation of the Presidential election. Suspect who has a student visa is a Bangladeshi national who come to the U.S. to launch a terrorist attack. Arrest was result a joint FBI-New York City police sting operation. Suspect was pulling detonator on disabled 1000-pound van bomb when arrested. On August 9, 2013 Nafis was sentenced to 30 years in prison. Prior to his sentencing Nafis wrote a letter apologizing to the people of America and New York for his actions which he said were caused by personal and family problems and said he is now pro American.
- November 29, 2012: Raees Alam Qazi and his brother Sheheryar Alam Qazi of Florida naturalized citizens of Pakistani descent arrested for being in the aspirational stages of a plot to attack New York City. Raees Alam Qazi is alleged be inspired by Al Queda and of trying to contact terrorists abroad. On June 11, 2015 Reees and Sheheryar were sentenced to 35 and 20 years respectively for the plot and attacking federal officials while in custody.
- June 19, 2013: Two middle aged upstate New York men Scott Crawford and Eric J. Feight arrested by FBI in alleged plot to target a political figure reported to be President Obama and a Muslim group deemed enemies of Israel by constructing and using an X-Ray Gun that was described by the FBI as "useful and "functional". Obama was believed by the pair to be allowing Muslims into the country without background checks. Investigation was launched when a synagogue and the Ku Klux Klan whom Crawford was a member of told authorities that Crawford tried to recruit them to take part in the alleged plot.
- December 13, 2013: Terry Lee Loewen, an avionics technician, was arrested for attempting to bomb the Wichita Mid-Continent Airport. A Muslim-convert inspired by Anwar Al-Awlaki, he is alleged to have spent several months planning a suicide attack with a car-load of explosives.
- 2014: Brandon Orlando Baldwin and Olajuwon Ali Davis allegedly plotted to kill St. Louis County, Missouri Prosecuting Attorney Robert McCulloch and Ferguson, Missouri Police Chief Tom Jackson as well as bomb the Gateway Arch in reaction to the shooting of Michael Brown. The suspects were caught as a result of an undercover operation.
- March 26, 2015: Hasan R. Edmonds, an Illinois National Guardsman, and his cousin, Jonas M. Edmonds, arrested in an alleged terrorist plot against a Northern Illinois military base. The alleged plot involved Hasan leaving the country and Jones using Hasan's uniform to gain access. Motive was to bring "the flames of war to the heart" of America. Alleged plot broken up by sting operation.
- April 2, 2015: Two women from Queens, New York, 28-year-old Noelle Velentzas and 31-year-old Asia Siddiqui, arrested on charges of trying to detonate explosives in the US. They had purchased propane tanks. It is believed to be first case of a women only conceived terror plot in the US. Suspected busted by sting operation. Siddiqui alleged to have Al Quaeda contact. On May 7, the two pled not guilty.
- April 10, 2015: the FBI arrested 63-year old Robert Rankin Doggart, of Signal Mountain, Tennessee, who ran as a congressional candidate in 2014. He was wiretapped explaining plans to raise a militia to burn down a mosque, school and cafeteria and gun down Muslims in an enclave called Islamberg in New York. He planned to amass M4 carbines, pistols, Molotov cocktails and machetes, saying "We will offer [our] lives as collateral to prove our commitment to our God," and "We shall be Warriors who inflict horrible numbers of casualties upon the enemies," and "If it gets down to the machete, we will cut them to shreds." He has a Ph.D. from a diploma mill and an ordination from an ordination mill. He pled guilty on May 15, 2015.
- June 17, 2015: Fareed Mumuni, 21 of Staten Island and Munther Omar Saleh, 20 of Queens arrested for allegedly trying to conspire to assist ISIS in committing an attack in the New York area. Both suspects allegedly charged at law enforcement trying to arrest them with a knife.
- July 3–5, 2015: F.B.I. Director James Comey said his agency disrupted multiple July 4 weekend terror plots.
- July 13, 2015: Alexander Ciccolo, 23, of Adams, Massachusetts a son of a Boston police captain arrested in plot to attack a state college and broadcast executions of students on the internet. Suspect who was turned in by his father is said to be inspired by ISIS and reportedly characterized America as "Satan" and "disgusting". Ciccolo has guns and possible bomb making equipment.
- August 22, 2015: Kevin Norton, 18, and James Stumbo, 27 of Iowa were arrested in a plot to shoot up the 2015 Pokémon World Championships. The two posted status updates and images of their weaponry on social media, which were noticed by various Pokémon fans who treated them as supposed threats against the tournament. The two were arrested on charges of unlicensed possession of firearms and ammunition. The weapons recovered were a recently purchased Remington shotgun, an AR-15, a hunting knife and several hundred rounds of ammunition.
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On November 7, 1837, Elijah Parish Lovejoy was killed by a pro-slavery mob while defending the site of his anti-slavery newspaper, The Saint Louis Observer.
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After the McKinley assassination, a Pinkerton man proposed creating a new government agency dedicated to eradicating the nation's radicals.
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