British authorities now believe that all of the 10-pound rucksack bombs were the work of one man.

Contrary to previous reports, they also believe that the materials used were not homemade but sophisticated military explosives, possibly smuggled into Britain from the Balkans.

"The nature of the explosives appears to be military, which is very worrying," Superintendent Christophe Chaboud, the chief of the French anti-terrorist police, who was in London to help Scotland Yard, told the Times.

The investigation of the London bombings is turning into Britain's largest ever.

More than 800 police officers were being drafted in to assist Scotland Yard�s anti-terrorist branch in Britain�s largest criminal inquiry. Film from 2,500 CCTV cameras in the center of the capital is being examined and more is being taken from cameras across Greater London. Detectives are also searching for a vehicle, flat or garage that the terrorists may have used as a bomb factory.

The paper also reported that forensic pathologists have been paying particular attention to the remains of two bodies found in the mangled wreckage of the double-decker.

A senior police source said: "There are two bodies which have to be examined in great detail because they appear to have been holding the bomb or sitting on top of it. One of those might turn out to be the bomber."

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