Two bombs exploded Monday near the finish line of the Boston Marathon, killing at least two people and injuring dozens more. While such terrorist attacks are more common overseas, there is a history of other attacks on American soil.
On May 1, 2010, a car bomb was discovered in New York City's Times Square after street vendors saw smoke coming from a vehicle. The bomb ignited, but failed to detonate and was disarmed before it could cause any injuries. Faisal Shahzad, a naturalized U.S. citizen born in Pakistan, would eventually plead guilty to 10 counts arising from the bombing attempt.
The biggest terrorist attack on American soil took place on Sept. 11, 2001, with two hijacked airliners being flown into the World Trade Center in New York City as part of coordinated attacks on the East Coast. Both towers eventually collapsed, resulting in 2,753 deaths.
The Sept. 11, 2001, attackers also flew another hijacked jet into the Pentagon in Washington, D.C., leading to a partial collapse on the building's western side and killing 189 people.
A fourth plane, United Airlines Flight 93, was targeted at the U.S. Capitol, but crashed into a field near Shanksville, Pa., after its passengers tried to overcome the hijackers. The four hijackers died in the crash along with 40 people on the plane. Here, tokens honoring Flight 93 can be seen near the fence surrounding a construction site for a permanent memorial in May 2011.
In 2005, Eric Robert Rudolph pleaded guilty to numerous federal and state homicide charges in connection with a series of bombings across the southern United States between 1996 and 1998, killing two people and injuring at least 150 others in the name of an anti-abortion and anti-gay agenda. Included in his attacks was a Jan. 29, 1998, bombing at a Birmingham, Ala., abortion clinic that killed police officer and part-time clinic security guard Robert Sanderson, and critically injured nurse Emily Lyons.
Rudolph was also responsible for the Jan. 16, 1997, bombing of a building in the Atlanta suburb of Sandy Springs containing an abortion clinic. Six people were injured, the clinic was left in ruins and the blast blew out windows across the street.
Rudolph also was responsible for a pipe bomb that exploded at Centennial Olympic Park in Atlanta during the 1996 Summer Olympics. One woman, Alice Hawthorne, was killed and a cameraman suffered a heart attack fleeing the scene. Another 111 people were injured in the attack.
"Unabomber" Theodore Kaczynski killed three people and injured another 23 with his home-made bombs between 1978 and 1995. He was captured at his remote cabin outside Lincoln, Mont., on April 3, 1996. Combing his cabin, FBI investigators found a wealth of bomb components, 40,000 handwritten journal pages that included bomb-making experiments and descriptions of the Unabomber crimes; and one live bomb, ready for mailing.
Timothy McVeigh and Terry Nichols were convicted in the April 19, 1995, bombing of the Alfred P. Murrah Federal Building in downtown Oklahoma City that killed 168 and injured more than 680 people. McVeigh was executed by lethal injection on June 11, 2001, and Nichols is serving a life sentence with no possibility of parole.
On Feb. 26, 1993, a truck bomb parked below the North Tower of the World Trade Center in New York City exploded, killing six and injuring more than 1,000 people. A total of six people, including mastermind Ramzi Yousef, would eventually be convicted in the attack and sentenced to life in prison.
On Nov. 7, 1983, a bomb exploded inside the United States Capitol shortly before 11 p.m. No people were harmed, but an estimated $250,000 in damage was caused. In May 1988, six members of the "Resistance Conspiracy" were arrested and charged with the bombing, as well as related bombings of Fort McNair and the Washington Navy Yard.
On Jan. 24, 1975, a bomb exploded in New York City's historic Fraunces Tavern, killing four and wounding more than 50 people. A Puerto Rican nationalist group claimed responsibility and police tied 13 other bombings to the group. The tavern is seen here in 2008.
A TNT bomb planted in an unattended horse-drawn wagon exploded on Wall Street in New York City on Sept. 16, 1920, killing 38 people and injuring hundreds more. Bolshevist or anarchist terrorists were believed to be responsible for the attack, but the crime was never solved. The attack was the deadliest act of terrorism on U.S. soil up to that point.
A large bomb destroyed the Los Angeles Times building in downtown Los Angeles, killing 21 and injuring more than 100, on Oct. 1, 1910. The bomb was set by a union member belonging to the International Association of Bridge and Structural Iron Workers as a response to Harrison Gray Otis, publisher of the Los Angeles Times, who was vehemently anti-union. The bomb, 16 sticks of dynamite in a suitcase, was intended to go off at 4 a.m. when the building would be empty but the clock timing mechanism was faulty. It instead went off at 1:07 a.m. and ignited natural gas main lines under the building.