Osama Bin Laden Triggers Security Alert, Recall Elite Marine Unit

U.S. intelligence and law enforcement authorities warned today that al Qaeda may try to strike back at the U.S. for the death of Osama bin Laden and in a sign of the urgency, an elite unit of Marines who handle chemical and biological weapons attacks was recalled today from Japan..... "Though bin Laden is dead, al-Qaeda is not," said CIA Director Leon Panetta. "The terrorists almost certainly will attempt to avenge him, and we must—and will—remain vigilant and resolute. But we have struck a heavy blow against the enemy." ...