September 11, 2001: Members of the Al-Qaeda network steered two passenger jets into the twin towers of New York's World Trade Center, causing them to collapse. A third aircraft hit the Pentagon in Washington and a fourth hijacked plane crashed in Pennsylvania. Nearly 3,000 people died in the attacks, the worst on US soil.
July 27, 1996: The Centennial Olympic Park Bombing in Atlanta during the Summer Olympics killed two people and left 112 wounded.
October 9, 1995: A train bound from Miami to Los Angeles derailed in the Arizona desert with saboteurs calling themselves "Sons of Gestapo" claiming responsibility. One person died and more than 80 were wounded. Investigators said the attack could be linked to the 1993 siege of a ranch owned by the Branch Davidians sect in Waco, Texas in which 80 people died.
April 19, 1995: 168 people died and more than 500 were wounded in the Oklahoma City bombing in which Timothy McVeigh, an American militia movement sympathizer and Gulf War veteran, exploded a truck containing explosives outside the Alfred P Murrah Federal Building. He was sentenced to death in June 1997 and executed on June 11, 2001.
February 26, 1993: A truck bomb detonated in a car park under one of the towers of the World Trade Center killing six people and wounding about 1,000. In May 1994, four Islamists were sentenced to a total 240 years in prison. The attack was later blamed on an Egyptian movement led by blind Muslim cleric Omar Abdel Rahman who was sentenced to life by a US court in 1996.
May 16, 1981: One person died in an explosion in a men's room of the Pan American terminal at New York's JFK airport. A group calling itself Puerto Rican Armed Resistance claimed responsibility for the attack.
December 29, 1975: The explosion of a bomb in a locker at New York's La Guardia airport killed 11 people and wounded 75.
January 24, 1975: An explosion in a New York tavern killed four people. The blast is one of 49 attacks attributed to Puerto Rican nationalist group FALN between 1974 and 1977.
August 24, 1970: A researcher at University of Wisconsin-Madison died in a bomb blast attributed to militant pacifists.