It's been five years since the Islamic State was defeated by a U.S.-led military campaign in Syria. But today some 10,000 ISIS fighters remain jailed inside Syrian detention centers. Human rights groups call conditions in the prisons abusive and local authorities warn they are a breeding ground for radicalization and an Islamic State revival. Special correspondent Leila Molana-Allen reports. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders