Osama bin Laden, the longtime al-Qaeda leader and chief architect of the Sept. 11, 2001, terrorist attacks on the United States, was killed Sunday by U.S. forces, President Obama announced late Sunday night. Acting on an intelligence lead that first surfaced last August, Obama said he authorized an operation to kill bin Laden, who was hiding in a compound deep inside Pakistan. The president, in a rare Sunday night address to the nation, said U.S. forces killed bin Laden during a firefight and captured his body.