London 3

As many as 40 people may have been killed and many more have been injured in a series of at least seven explosions in the London underground subway system and on a double-decker bus. The BBC reports that British Prime Minister Tony Blair said it was "reasonably clear" there had been a series of terrorist attacks. London's police chief Sir Ian Blair said "traces of explosives had been found at one site."

An Islamist website posted an announcement, apparently coming from Al Qaeda, that took credit for the explosions. Sky News reports that a previously unknown group calling itself "Secret Organization: Al Qaeda in Europe" took credit for the blasts, saying they were in revenge for British "military massacres" in Iraq and Afghanistan. The group also warned Italy and Denmark to withdraw their troops from Iraq and Afghanistan.