23:57President Bush arrives at the White House
23:29Giuliani says 10,000 injured in attack
23:21US denies involvement in Afghan explosions
23:07Reports of explosions in Afghan capital
22:50US Financial markets to remain closed tomorrow
22:41Pentagon officials tonight estimated an attack has resulted in 100 casualties.
22:31Bush to address nation later this evening
22:25Another World Trade Centre building - the 47 storey Building 7 - collapses
22:11NATO and EU to hold emergency meetings
21:45New York Mayor Giuliani says 2,100 people injured.
21:3045 die in fourth plane aimed at Camp David
20:10NATO and EU to hold emergency meetings.
19:36All 45 believed dead in crash near Pittsburgh.
19:15New York hospitals braced for attack victims.
19:08US put on full wartime alert after attacks.
18:20President Bush leaves Barksdale Air Force Base in Louisiana for an undisclosed location.
18:11Hamas denies links with aircraft attacks.
17:39President Bush makes second statement and vows to hunt down and punish those responsible.
17:33United Airlines confirms a second of its planes has crashed at an unknown location.
15:30Reports emerge of a plane crash near Somerset County Airport, Pittsburgh.
15:27The north tower of the World Trade Centre collapses.
15:25Car bomb explodes outside the State Department in Washington.
15:12British Prime Minister Tony Blair describes the attacks in the United States as "the most terrible shocking event".
15:07The south tower of the World Trade Centre tower collapses.
14:50All airports across the US are shut down.
14:45The White House is evacuated amid further terrorist threats.
14:43Reports emerge that a plane crashed near the Pentagon, in Washington.
14:32Reports that one of the planes was an American Airlines Boeing 767 that took off from Boston.
14:30US President George Bush says: "We have had a national tragedy. Two aeroplanes have crashed into the World Trade Centre in an apparent terrorist attack on our country."
14:29First reports of casualties indicate that at least six people were killed, with at least 1,000 injured.
14:20Reports emerge that the FBI is investigating reports of a plane being hijacked before World Trade Centre crashes.
14:16A second airliner crashes into the second tower, causing a devastating explosion. Television stations show the dramatic pictures.
13:58 [Irish Times]Jet airliner crashes into the World Trade Centre in New York.