A no-fly zone over Libya is in place, according to U.S. Joint Chiefs of Staff Chairman Adm. Mike Mullen. Coalition forces have taken out most of Libya's air defense systems and some of its airfields, Mullen said on CNN's State of the Union. The U.S. and England launched over 100 cruise missiles at Libya's air defenses, and followed with aerial bombings. A U.S. military official said four American B-2 bombers dropped more than 40 bombs on a major Libyan airfield. Gaddafi remains defiant, saying he'll arm the Libyan population against the “crusader coalition.” The Arab League, which backed a no-fly zone, says the strikes have gone beyond what they supported. "What happened differs from the no-fly zone objectives," says Amr Moussa, the head of the Arab League. "What we want is civilians' protection not shelling more civilians." Libya says 48 people have been killed, including civilians.