Manhunts begin amid theories of suicide bomber

Stewart Little in London

Senior officers refused to rule out the possibility that Britain had been subjected to its first suicide bombing after the series of co-ordinated no-warning strikes in the centre of the city.

A passenger on a double decker bus that was ripped apart in one of the four blasts said he saw an “extremely agitated” man rummaging in a bag just seconds before the explosion. Richard Jones, 61, an IT consultant, said he saw a man in his mid-20s on the bus become “extremely agitated”.