An interesting account from Sky News about the bomb on the double-decker bus:
Security sources have told Sky News that a high explosive was found on the bus, similar to that used in the July 7 attacks.
They said the strong smell of acetone would have sparked fears of a chemical attack.
And the smell indicated that the explosives had been made up incorrectly, with too much acetone and not enough peroxide.
Witnesses to the explosion said there had been a bang followed by the smell of smoke.
By the way, acetone is the primary ingredient in nail polish remover (if you are wondering what acetone smells like).
Other accounts of the bombs on the trains also mentioned a chemical smell. And early reports suggested that perhaps only the detonators exploded. This Sky News story suggests that the reason for the smell and the small size of the explosions may have been faulty bomb-making.
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