Description:A U.S. drone attack in Pakistan has killed this man, Abu Yahya al-Libi, one of al Qaeda's top ranking officials. Seen here in file footage, al-Libi was considered al Qaeda's second-ranking member. Officials say he was among al Qaeda's most experienced and versatile figures and had the authority to issue fatwas, and make operational approvals. Reaction from the White House was enthusiastic.(0:56)