On September 11, 2001, nearly 3,000 people were killed, 400 were police officers and firefighters, in the terrorist attacks at the World Trade Center.
9/11 was not the first terrorist attack on the World Trade Center.
Passengers aboard United Flight 93, heard about the previous airplane attacks and attempted to retake control of the plane from hijackers.
Video accounts of the WTC attack aired immediately
The attack on the World Trade Center on 9/11 resulted in the largest loss of life by a foreign attack on American soil.
18 people were rescued alive from the rubble of the World Trade Center site.
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