A man returns home from the mosque in central Mogadishu, Somalia, just before dawn on May 21. AMISOM, in support of the Somali Police Force, last night cordoned off one square kilometer in the Wardhiigleey district of Mogadishu in an attempt to weed out members of the extremist group, al Shabaab. Many of the area's young men were temporarily detained by the SPF and then screened in order to determine whether they had any links to the group. AU UN IST PHOTO/ TOBIN JONES.