Islamic State has released a propaganda video promising terror attacks on the UK and purporting to show the execution of five British spies.
The ten-minute long clip, which was released by the militant group today, features a man and a young boy, both of whom appear to speak with British accents.
Their identities could not immediately be established.
The footage shows five men wearing orange overalls and appearing to "confess" to spying for UK security services.
They can then be seen kneeling on the ground at the feet of five executioners.
A terrorist then tells the camera the alleged spies were "abandoned" by the British government.
In a direct challenge to David Cameron and the British government, a masked militant is seen telling the camera that IS will "invade your land, where we will rule by the Shariah".
The man goes on to brand the Prime Minister an "imbecile" and a "slave of the White House".
The clip then ends with footage of a young child speaking in a British accent, who appears to say: "We will kill the kuffar [non-believers] over there."
Experts cast doubt on whether those apparently killed during the execution were British.
Charlie Winter, a research associate at Georgia State University who has studied the rise of IS closely, said the apparent victims are alleged to have provided intelligence that led to jihadists from the UK being targeted in air strikes.
The Foreign and Commonwealth Office has been contacted for comment.
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