Four blasts rocked the London subway and tore open a packed double-decker bus during this morning's rush hour, sending bloodied victims fleeing after what a shaken Prime Minister Tony Blair called a string of "barbaric" terrorist attacks. Here is a timeline of the events in London.
All times are in British Summer Time, which is five hours ahead of Eastern Standard Time.
08:50 a.m. Three blasts occur in the London subway within 50 seconds of one another
09:15 a.m.: Press Association reports emergency services called to Liverpool Street Station after reports of an explosion
09:24 a.m.: Transport Police say the incident was possibly caused by a collision between two trains, a power cut or a power cable exploding. Police report "walking wounded"
09:33 a.m.: Passengers are told that all London Underground services are being suspended because of a power fault across the network
09:33 a.m.: London Underground reports "another incident at Edgware Road" station
09:40 a.m.: Transport Police say power surge incidents have occurred on the Underground at Aldgate, Edgware Road, King's Cross, Old Street and Russell Square stations
10:02 a.m.: Scotland Yard says it is dealing with a "major incident"
10:09 a.m.: Witness Christina Lawrence, who was on a train leaving King's Cross, tells BBC News 24: "There was a loud bang in the tunnel and the train just stopped and all of a sudden it was filled with black, gassy smoke and we couldn't breathe"
10:14 a.m.: An eyewitness tells PA that a bus has been ripped apart in an explosion in central London
10:21 a.m.: Scotland Yard reports "multiple explosions" in London
10:23 a.m.: Transport Police confirm an explosion on a bus in Tavistock Square
10:25 a.m.: A BBC reporter traveling with British Prime Minister Tony Blair to the G8 summit in Scotland says 10 Downing Street is "still unsure" whether the explosions are a terrorist attack
10:25 a.m.: PA reports two buses damaged in explosions - one in Russell Square and another in Tavistock Square. Witness Belinda Seabrook said of the Russell Square blast: "I was on the bus in front and heard an incredible bang, I turned round and half the double decker bus was in the air"
10:25 a.m.: Transport union officials say they have reports of explosions on three buses, Associated Press reports
10:39 a.m.: All London hospitals have been put on major incident alert, a hospital spokesman tells PA
10:49 a.m.: Police say there are serious casualties, but no deaths are confirmed, PA reports
10:51 a.m.: A passenger on a train at Edgware Road says he saw several bodies in the wreckage. A police spokesman says two trains remain stuck in tunnels at Edgware Road
10:53 a.m.: British Home Secretary Charles Clarke makes a statement outside Downing Street about "dreadful incidents" causing "terrible injuries." He says Blair has been informed and advises the public in London not to make unnecessary journeys
10:55 a.m.: A doctor tells Reuters there are at least 90 casualties at Aldgate station