Western officials have said they believe they know the identity of `` Jihadi John '' But they may be withholding it as a way to get closer to him , an ex-CIA officer says . Expert : The Islamic State is known for its brutal treatment of prisoners and has been accused by human rights groups of using torture on captured fighters.
Western officials have said they believe they know the identity of `` Jihadi John '' But they may be withholding it as a way to get closer to him , an ex-CIA officer says . Expert : The black-clad militant 's latest appearance shows ISIS `` resilient ''