Islamic State militants have released a video, featuring a man and young boy speaking with British accents, purportedly showing the killing of five men who it says were spying for the UK. <br />In the 10-minute film, the man threatens attacks in the UK and says this is a message for David Cameron. <br />A boy later appears in the video, which has not been independently verified, talking about killing "unbelievers". <br />The UK Foreign Office said it was examining the video's content.
