Soldiers belonging to the African Union Mission in Somalia stand guard during an operation aimed at improving security in Mogadishu, Somalia, 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.