A former detainee 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 this May 11, 2017 photo. He covered his face for fear of being detained again. He and other former detainees say abuses are widespread in a network of secret prisons run by the United Arab Emirates and its Yemeni allies, into which hundreds detained in the hunt for al-Qaida militants have disappeared. (AP Photo/Maad El Zikry)
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