Less than four years after 9/11, Islamic extremists struck London, not with planes, but with backpacks. On the morning of July 7, 2005, four suicide bombers detonated their explosives on three subway trains and a double-decker bus. The terrorists three of whom had been born in Britain killed 52 other people and injured hundreds more. "This is a very sad day for the British people," then Prime Minister Tony Blair said, "but we will hold true to the British way of life."