Timeline of events
Plane crashes into tower of World Trade Center in lower Manhattan, shortly before 9 a-m Eastern.
Second plane crashes into the second tower of the World Trade Center, shortly after 9 a-m Eastern.
President Bush, in Sarasota, Florida, calls the crashes "an apparent terrorist attack" and a "national tragedy."
An aircraft crashes near Pentagon, just outside of Washington D-C, in Northern Virginia, about an hour after the attacks in New York.
Government buildings in Washington, including the Capitol and the White House, are evacuated with officials citing a credible threat of a terrorist attack.
The Federal Aviation Administration shuts down all aircraft takeoffs nationwide.
Shortly after 10 a-m Eastern, one World Trade Center tower in New York collapses, about an hour after being hit by plane.
American Airlines says one of the planes that crashed into the Trade Center was American Airlines Flight 11, hijacked after takeoff from Boston en route to Los Angeles.
Senior law enforcement officials say car bomb explodes outside of State Department in Washington, D-C.
Financial markets suspend trading in the wake of the attacks.
The second tower of the World Trade Center collapses at 10:28 a-m Eastern.
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