- A U.N. commission says its report is based on more than 600 interviews and documentary material
- Detainees have suffered on all sides of Syria's civil war, the report says
- "Nearly every surviving detainee has emerged ... having suffered unimaginable abuses," commission chief says
(CNN)They were prisoners of war on different sides of a conflict that's raged for nearly five years. But all of them faced a horrifying reality, according to a new report on Syria released by the United Nations.