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 confirmed killed in the explosions. But official statement have so far reported at least two dead and 185 injured in a wave of apparently coordinated bomb attacks across the British capital.

Source: Xinhua