In the summer of 2014, after the Islamic State group, also known as ISIS, overran the northern Iraqi town of Sinjar, thousands of Yazidis — who practice an ancient religion predating Islam and Christianity, and are considered “devil worshippers” by the Sunni militant group — were killed, raped and enslaved. While most of the surviving Yazidi population now lives in makeshift camps in the Kurdistan region, an unknown number of Yazidi women are still being held captive by ISIS.