The account is also mentioned in a Scotsman article:
http://news.scotsman.com/index.cfm?id=756602005
Richard Jones, a passenger from Scotland, said he had just alighted from the bus when the bomb went off: "I got ten yards away and the bus exploded," he said.
"Basically, there was a young gentleman, an olive-skinned gentleman, in front of me and he kept diving into a bag at his feet. He became more and more agitated and so, on reflection, that may have been the bomber I was standing next to."
or
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