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Tuesday's chronology of terror

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8:45 a.m. (all times are EDT): A hijacked passenger jet, American Airlines Flight 11 out of Boston, Mass., crashes into the north tower of the World Trade Center.

9:03 a.m.: A second hijacked airliner, United Airlines Flight 175 from Boston, crashes into the south tower of the World Trade Center and explodes. Both buildings are burning.

9:17 a.m.: The Federal Aviation Administration shuts down all New York City area airports.

9:40 a.m.: The FAA halts all flight operations at U.S. airports, the first time in U.S. history that air traffic nationwide has been halted.

9:43 a.m.: American Airlines Flight 77 crashes into the Pentagon.

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

10:10 a.m.: A portion of the Pentagon collapses.

10:10 a.m.: United Airlines Flight 93, also hijacked, crashes in Somerset County, Pennsylvania, southeast of Pittsburgh.

10:13 a.m.: The United Nations building is evacuated.

10:24 a.m.: The FAA reports that all inbound transatlantic aircraft flying into the United States are being diverted to Canada.

10:28 a.m.: The World Trade Center's north tower collapses. 10:45 a.m.: All federal office buildings in Washington are evacuated.

10.48 a.m.: Police confirm the plane crash in Pennsylvania.

11:18 a.m.: American Airlines reports it has lost two aircraft. American Flight 11, a Boeing 767 flying from Boston to Los Angeles, had 81 passengers and 11 crew aboard. Flight 77, a Boeing 757 en route from Washington's Dulles International Airport to Los Angeles, had 58 passengers and six crew members aboard. Flight 11 slammed into the north tower of the World Trade Center. Flight 77 hit the Pentagon.

11:26 a.m.: United Airlines reports that United Flight 93, en route from Newark, New Jersey, to San Francisco, California, has crashed in Pennsylvania. The airline also says that it is 'deeply concerned' about United Flight 175.

11:59 a.m.: United Airlines confirms that Flight 175, from Boston to Los Angeles, has crashed with 56 passengers and nine crew members aboard. It hit the World Trade Center's south tower.

12:04 p.m.: Los Angeles International Airport, the destination of three of the crashed airplanes, is evacuated.

12:15 p.m: San Francisco International Airport is evacuated and shut down. The airport was the destination of United Airlines Flight 93, which crashed in Pennsylvania.

1:04 p.m.: Bush, speaking from Barksdale Air Force Base in Louisiana, says that all appropriate security and puts the U.S. military on high alert worldwide.

1:44 p.m.: The Pentagon says five warships and two aircraft carriers will leave the U.S. Naval Station in Norfolk, Virginia, to protect the East Coast from further attack.

2:30 p.m.: The FAA announces there will be no U.S. commercial air traffic until noon EDT Wednesday at the earliest.

4 p.m: U.S. officials say there are 'good indications' that Saudi militant Osama bin Laden, suspected of coordinating the bombings of two U.S. embassies in 1998, is involved in the attacks.

5:20 p.m.: The 47-story Building 7 of the World Trade Center complex collapses.

6 p.m.: Explosions are heard in Kabul, Afghanistan.

6:54 p.m.: Bush arrives back at the White House aboard Marine One.

7:45 p.m.: The New York Police Department says that at least 78 officers are missing. The city also says that as many as half of the first 400 firefighters on the scene were killed.

9:22 p.m.: Fire at the Pentagon is still burning .

10:49 p.m.: Attorney General Ashcroft told members of Congress that there were three to five hijackers on each plane armed only with knives.

10:56 p.m: CNN's Zahn reports that New York City police believe there are people alive in buildings near the World Trade Center.

11:54 p.m.: A government official said there was an open microphone on one of the hijacked planes and that sounds of discussion and 'duress' were heard.