MOSUL, Iraq (AP) — In 2014, Abdulrahman Saad was taken from his home in Mosul by Islamic State fighters, leaving his family in limbo.

They asked IS security offices and judges: Where is our husband and father? No answer. When the operation to retake Mosul began, they heard he was being held in the western part of the city, with hundreds of other prisoners. But when the area was liberated, they found no trace of Saad, the 59-year-old owner of a wholesale food store.