In this Saturday, Feb. 24, 2012 photo, illegal African immigrants and suspected mercenaries stand at a barred door in a prison in Gherian, Libya. Six months after Gadhafi's ouster, the nominal central government stands largely helpless and unable to impose its authority. Tripoli remains under the control of various revolutionaries-turned-militiamen, mainly from the nearby city of Misrata and the western mountain town of Zintan, who have resisted calls to integrate into a national army. (AP Photo/Manu Brabo)

Associated Press
In this Saturday, Feb. 24, 2012 photo, illegal African immigrants and suspected mercenaries stand at a barred door in a prison in Gherian, Libya. Six months after Gadhafi's ouster, the nominal central government stands largely helpless and unable to impose its authority. Tripoli remains under the control of various revolutionaries-turned-militiamen, mainly from the nearby city of Misrata and the western mountain town of Zintan, who have resisted calls to integrate into a national army. (AP Photo/Manu Brabo)
In this Saturday, Feb. 24, 2012 photo, illegal African immigrants and suspected mercenaries stand at a barred door in a prison in Gherian, Libya. Six months after Gadhafi's ouster, the nominal central government stands largely helpless and unable to impose its authority. Tripoli remains under the control of various revolutionaries-turned-militiamen, mainly from the nearby city of Misrata and the western mountain town of Zintan, who have resisted calls to integrate into a national army. (AP Photo/Manu Brabo)
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