In this May 11, 2017, file photo, a former detainee covers his face for fear of being detained again, as he shows how he was kept in handcuffs and leg shackles while held in a secret prison at Riyan airport in the Yemeni city of Mukalla. In a report released Thursday, July 12, 2018, Amnesty International called for an investigation into alleged disappearances, torture and likely deaths in detention facilities in southern Yemen as possible war crimes. (AP Photo/Maad El Zikry, File)
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