Three of the London suicide bombers staged a dry run to the British capital just over a week before they blew themselves up on the transport network and killed 52 commuters, the police said today.
Anti-terrorist police chief Peter Clarke told reporters that surveillance television footage showed three of the four bombers visited London on June 28th and spent nearly four hours travelling around the capital.
"The obvious suggestion is they possibly were conducting a reconnaissance on that day. We know that's part of terrorist mythology," said Mr Clarke.
"It was a dry run."
He said they travelled by train from Luton, north of the capital, and arrived at Kings Cross station in London just before 9am.
They were then captured on CCTV cameras at Baker Street underground station and again at Kings Cross shortly before 1 pm. He said two of the men were carrying rucksacks but there was nothing to indicate there were bombs inside.