British Prime Minister Tony Blair Thursday left the Group of Eight summit by helicopter to be briefed on the attacks in London, but the G8 summit will continue.
Britain's Home Secretary Charles Clarke confirmed that there were four explosions in central London on Thursday.
Speaking at the House of Commons, Clarke said three were on subway trains and the fourth was on a bus.
"We do not know who or what organizations are responsible for these terrible criminal acts," the home secretary said.
Latest reports said at least 10 people have been killed in the explosions and 185 injured in a wave of apparently coordinated bomb attacks across the British capital.
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