FILE - In this April 24, 2012 file photo, fighters from Islamist group Ansar Dine stand guard during a hostage handover in the desert outside Timbuktu, Mali. The Mali army attacked Islamist rebels with heavy weapons in the center of the country which divides the insurgent-held north and the government-controlled south, government officials said Thursday, Jan. 10, 2013. (AP Photo/File)
