'At least one bomber died'
At least one of the bombers in last week's terror attacks in London died at the scene of an explosion, police said today.
They said there was forensic evidence that meant it was "very likely" the bomber responsible for the train explosion at Aldgate died there.
Property belonging to other suspects has also been found at the scenes of the other explosions.
One man has been arrested in West Yorkshire and is being brought to London for questioning.
Deputy Assistant Commissioner Peter Clarke, head of Scotland's Yard anti-terrorist branch, said: "The investigation quite early led us to have concerns about the movement and activities of four men, three of whom came from the West Yorkshire area.
"We are trying to establish their movements in the run-up to last week's attack and specifically to establish whether they all died in the explosions.
"Today we executed six warrants under the Terrorism Act at premises in the West Yorkshire area.
"These included the home addresses of three of the four men. A detailed forensic examination will now follow and this is likely to take time to complete.
"We know that all four of these arrived in London by train on the morning of Thursday, July 7.
"We have identified CCTV footage showing the four men at King's Cross Station shortly before 8.30am on that morning, July 7.
"One of them who had set out from West Yorkshire was reported missing by his family to the casualty bureau on July 7.
"We have been able to establish that he was joined on his journey to London by three other men.
"We have since found personal documents bearing the names of three of those four men close to the seats of three of the explosions.
"As regards to the man who is missing, some of his property was found on the route 30 bus in Tavistock Square.
"Property of a second man was found at the scene of the Aldgate bomb and in relation to a third man property with his name was found at the Aldgate and Edgware Road bombs.
"We have strong forensic evidence that it is very likely that one of the men from West Yorkshire died at the explosion at Aldgate.
"This is subject to confirmation by the coroner."
Mr Clarke said at one of the West Yorkshire addresses material had been found which had caused police to take measures to ensure there was no risk to the public.
"The investigation of what has been found will be a detailed and lengthy exercise," he said.
"At Luton a vehicle has been found in the station car park which we suspect is connected to this investigation.
"Steps are being taken to ensure there is no risk to the public.
"One man has been arrested in West Yorkshire and will be brought to London in custody."
Assistant Commissioner Andy Hayman added: "I want to conclude by making it absolutely clear that no-one should be in any doubt about the attack last Thursday is that of extremists and criminals."
