|At 0850 a bomb exploded on Circle line train number 204 travelling east from Liverpool Street station to Aldgate.
The device was placed on the floor at the rear of the second carriage. It killed seven people, plus the bomber, and injured 171, at least 10 seriously.
Passenger Simon Tonkyn told of an "enormous bang and a lot of smoke". He added: "A group of us got fire extinguishers and were able to smash through the carriage door."
Another man, Terry O'Shea, said passengers were led down the track past the carriage where the bomb had exploded. "We could see the roof was torn off it, and there were bodies on the track."
The bomber was named by police as 24-year-old Shehzad Tanweer, from Leeds.