After a suicide bomber killed five people at the United Nations food agency's Pakistan headquarters on Monday, the U.N. has announced that it will temporarily close down the offices. The bombing, which U.N. Secretary General Ban Ki-Moon called a "heinous crime," came one day after the new leader of Pakistan's Taliban, Hakimullah Mehsud, pledged retaliation against Pakistan and the U.S. for a recent increase in attacks along the Afghanistan border. The bomber reportedly entered the building dressed as a security guard and was armed with 18 pounds of explosives.
