Keith said some of the 13 killed in the Tavistock Square bus bombing were on board because they had been evacuated from the Underground.
Six of the dead briefly survived, some having been blown out of the bus onto the road. Of the other seven, five were dead in the bus and two blown clear from the top deck.
The long-awaited inquests, expected to last five months, will probe the reaction of the emergency services and examine whether the intelligence services could have prevented the attacks.
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