FILE - Clothing worn by a Yazidi girl enslaved by Islamic State militants, collected by a Yazidi activist to document Islamic State group crimes against the community, shown in this file photo taken May 22, 2016, in Dohuk, northern Iraq. The militants are tightening their grip on the estimated 3,000 Yazidi girls and women they hold as sex slaves, creating a database to identify them so they can't sneak away and assassinating smugglers who have tried to help rescue them. (AP Photo/Maya Alleruzzo, File), APTOPIX