ISIS executes ‘British spies’, threatens invasion of UK

In a new video message Sunday, ISIS showed five people it claimed were British spies being shot dead, as an ISIS fighter, speaking English with a London accent, derided British Prime Minister David Cameron over Britain's involvement in the war against ISIS. 
He told the British people that "we will continue to wage jihad, break borders and one day invade your land, when you will be ruled by Sharia." After the fighter finished addressing the camera, the five kneeling prisoners were shot in the head, one by one.