The gruesome beheading of a British aid worker by the ISIS terror group in Syria over the weekend provoked a stern warning from Britain’s Prime Minister David Cameron who vowed to “hunt down the murderers” for their “act of pure evil”. The British victim was named as David Haines, a 44-year-old aid worker, who had been held hostage in Syria for many months. A graphic video released by his killers shows Haines kneeling on the ground dressed in an orange jumpsuit as a masked executioner severs his throat with a knife. The dead man’s prone body is then filmed with a decapitated, bloody head placed on the corpse’s back. Some analysts have disputed the veracity of the video, saying it is a fake. But Haine’s foreboding demeanor and his final words spoken to the camera tend to verify the recording as genuine. The British government has also stated that it believes the footage to be authentic.