Kings Cross was the first carriage, and I think the third at Aldgate and the second at Edgware - this has just been confirmed by the police at their press conference on BBC News 24, so information should be generally available shortly.
This is what the BBC News website is saying too. They're also saying the bombs were less than 10lb of explosive and placed on the floor of the tube trains, and on the floor or downstairs seat of the bus.
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