2011/03/18 Headlines: Japan Raises Nuclear Alert; Burying of Reactors Mulled; Up to 40 Pakistani Civilians Killed in U.S. Drone Strike; Pakistanis Protest Release of CIA Agent; Libya Declares Ceasefire After U.N. Authorizes No-Fly Zone; Bahrain Arrests Opposition Leaders, Clears Protest Encampment; Aristide Set for Haiti Return; House Passes Bill to De-Fund NPR; U.S. Denies Travel Visa to Afghan Activist; U.S. Develops Social Media Propaganda Software