Footage of one of the July 7 attackers calmly rummaging around in his rucksack bomb as commuters walk nearby has been played at the inquests into their victims' deaths.
Hasib Hussain, 18, was captured on film walking around London's King's Cross station before boarding a number 30 bus and killing himself and 13 others in Tavistock Square.
Investigators compiled footage tracking him emerging from the Tube, joining others attempting to escape the travel chaos and wandering around the busy concourse.
Coroner Lady Justice Hallett watched as he attempted to telephone fellow bombers Mohammed Sidique Khan, 30, Shehzad Tanweer, 22, and Jermaine Lindsay, 19.
But he gets no answer as they have already detonated their home-made bombs on Tube trains near Russell Square, Aldgate and Edgware Road stations.
In extraordinary footage, Hussain can then be seen pausing in the doorway of a branch of WH Smith for two-and-a-half minutes to apparently remove a battery from his device.
He buys a £4.49 9-volt replacement and heads to a nearby branch of McDonald's, where police believe he spent eight minutes inserting the new battery into the bomb.
Hugo Keith QC, for the inquest, said: "He spends a very significant amount of time rooting around in a rucksack containing a highly unstable, cooled explosive mixture."
Detective Inspector Ewan Kindness, of Scotland Yard's Counter Terrorism Command, said when Hussain stands up again, something is in his hand. He said: "We believe it to be the batteries from the device, but it is difficult to be 100% sure from the image."
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A total of 52 innocent people were killed and more than 700 injured in the attacks, the worst single terrorist atrocity on British soil. The inquests were adjourned until Monday.
