Another atrocity by radical Muslims, but the terminology has taken a sinister turn.
ISIS are now calling those who oppose them as "Crusaders" and equate them with the atrocities committed by "Christian" armies in times past. They are trying to establish their reign of terror as a holy war in which they are the underdogs and Abu Bakr al-Baghdadi is some kind of modern Saladin, leading his people to victory over the infidels.
One of their recent statements, following bombing of Russia's Metrojet airliner, was "if the Crusaders bomb our people from the safety of their aircraft, we will bomb their aircraft". They are either unaware (possible for an Islamist) that Russia is predominantly atheist and not one of the Christian hordes riding in to dishonour the Prophet.