On July 7, 2005, four bombs struck the London public transportation system during the morning rush hour, killing 52 people—as well as the four bombers—and injuring some 700. The incident was the worst act of terrorism in the UK since the 1988 bombing of Pan Am Flight 103, which killed 270 people. The attacks appeared to be the work of Islamic suicide bombers, and later evidence indicated that they may have been directed by a member of Al Qaeda. Initial reports attributed the explosions to what? Discuss