8:45 a.m.: Jet airliner crashes into the north tower

of the World Trade Center in New York.

9:03 a.m.: A second airliner crashes into its twin

south tower, causing a devastating explosion.

9:10 a.m.: In Florida, President Bush is reading to

children in a classroom when his chief of staff,

Andrew Card, whispers news of the attacks into his ear.

9:20 a.m.: The FBI investigates reports of planes

being hijacked before the World Trade Center crashes.

9:29 a.m.: First reports of casualties indicate that

at least six people were killed, with at least 1,000 injured.

9:30 a.m.: Bush declares: "We have had a national

tragedy. Two airplanes have crashed into the World

Trade Center in an apparent terrorist attack on our country."

9:43 a.m.: Abu Dhabi television reports it received

a call from the Democratic Front for the Liberation

of Palestine, claiming responsibility for crashing

two planes into the WTC. However, leading officials

later deny the claim.

9:43 a.m.: Another plane crashes into the Pentagon

in Washington. The nerve center of the U.S.

military bursts into flames and a portion of one

side of the five-sided structure collapses.

9:48 a.m.: The White House and the Capitol are

evacuated amid further threats.

9:49 a.m.: All airports across the U.S. shut down.

10:00 a.m.: United Airlines Flight 93, en route from

Newark, N.J., to San Francisco, crashes near Pittsburgh.

The crash site is 85 miles northwest of Camp David.

10:05 a.m.: The south tower of the World Trade Center

collapses.

10:29 a.m.: The north tower of the World Trade Center

collapses.

12:33 p.m.: United Airlines confirms a second of its planes

has crashed at an unknown location.

12:39 p.m.: Bush makes a second statement, vowing to

hunt down and punish those responsible.

2:48 p.m.: New York Mayor Rudy Giuliani says the

eventual death toll from Tuesday's attack may be

"more than any of us can bear."