ISIS have issued a terror threat to the UK in a new video which purportedly shows the execution of five alleged British spies. In the video, which is as yet unverified, a masked gunman speaking in a British accent describes the Prime Minister David Cameron as an “imbecile” before apparently shooting the hostages accused of spying for the British security services. There are also threats made against the UK government and its citizens. British intelligence have said they are examining the authenticity of the tape, but will not comment on whether the featured victims ever worked undercover for the UK RT reports: The 11-minute clip, which has been leaked on social media, has the glossy production qualities and watermarks consistent with previous execution videos posted by the jihadist group. As its centerpiece, it features a narration from a man with British-Asian accent, reading out a scripted jeremiad directed towards Prime Minister David Cameron and the UK, which began to bomb IS positions inside Syria in the past month. The balaclava-clad man stands over the kneeling victims clad, who are wearing orange jumpsuits, as he accuses Cameron of being a “slave of the White House, and mule of the Jews” threatening [...]