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There are some bewildering gaps in the Whitehall account of 7/7; even the nature of the explosives used in the bombing is unclear. The report says only that "it appears" they were home-made, although there is plenty of evidence that the bombs were powered by at least some commercial or military explosive.
"Forensic science ... tends to produce unambiguous answers within a matter of hours and days," Mr Ahmed says. "The idea that continuous examination over many months has failed to finish the job beggars belief."
Furthermore, the substance that the bombers were said to have mixed from household products - TATP - produces neither flame nor heat upon detonation. But eyewitnesses reported both.