FILE - In this Thursday, Feb. 17, 2011 file photo, hundreds of newly trained al-Shabab fighters perform military exercises in the Lafofe area some 18km south of Mogadishu, in Somalia. A Somali intelligence official says Zakariya Ismail Ahmed Hersi, a leader with the Islamic extremist group al-Shabab who has a $3 million bounty on his head, has surrendered to police in Somalia. (AP Photo/Farah Abdi Warsameh, File)