ISIS militants pictured toppling crosses and smashing relics in Nimrud . Latest evidence of ISIS trying to cleanse caliphate of Christian heritage . Also attacked ancient city of Nineveh and 2000-year-old fortress city Hatra .
ISIS militants pictured toppling crosses and smashing relics in Nineveh . Latest evidence of ISIS trying to cleanse caliphate of Christian heritage . Also attacked ancient city of Nimrud and 2000-year-old fortress city Hatra .