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A bomb in a van exploded in the underground World Trade Center garage in NYC, killing six people and injuring more than 1,000 others. Five extremists were eventually convicted.
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A car bomb exploded outside of the Murrah Federal Building in Oklahoma City, killing 168 people and injuring more than 500. 2 people were convicted.
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At the Centennial Olympic Park in Atlanta during that year's Olympic Games, a bomb killed two people and injured more than 100. Eric Rudolph was arrested in 2003 and sentenced to life in prison.
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One guard was dead and a nurse injured after a bombing at an abortion clinic in Birmingham, Ala.
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Theodore Kaczynski pleaded guilty in Sacramento, Calif. to killing three people and injuring 23 during nationwide bombings between 1978 and 1995.
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Four commercial jets were hijacked by al-Qaida members and used to bring down the twin towers of the World Trade Center and crashed into the Pentagon. Combining New York, Washington and Pennsylvania counts, nearly 3,000 people were killed.
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On a flight from Paris to Detroit, Nigerian Umar Farouk AbdulMutallab attempted to blow up the airplane with explosives hidden in his underwear. He was stopped by passengers and crew members and sentenced to life.
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An SUV car bomb was disabled after a vendor saw smoke emitting from the car and notified police. Pakistani immigrant Faisal Shahzad was arrested and sentenced to life in prison.
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FBI arrested a man who attempted to detonate a car bomb at an annual-tree lighting ceremony. The bomb turned out to be a dummy device supplied to him by the FBI, according to reports from The Oregonian.
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A backpack bomb was placed along a parade route celebrating Martin Luther King Day in Spokane, Wash. It was meant to injure participants in a civil rights march, but was found and disabled before it exploded. Kevin Harpham, a white supremacist, was convicted.
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Two bombs exploded near the finish line of the Boston Marathon, killing three people and injuring more than 140.
