Group : Christians are clashing with ISIS in town where many Christians were abducted . ISIS is holding 150 Christians ISIS hostage in northeastern Libya , Assyrian activist says . Extremist group plans to release a video message threatening to kill hostages , he says .
Group : Kurds are clashing with ISIS in town where many Assyrians were abducted . ISIS is holding 150 Assyrian Christians hostage in northeastern Syria , Assyrian activist says . Extremist group plans to release a video message threatening to kill hostages , he says .