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.
In the 10-minute film, the man threatens attacks in the UK and says this is a message for David Cameron.
A boy later appears in the video, which has not been independently verified, talking about killing "unbelievers". The UK Foreign Office said it was examining the video`s content.
`Extraordinary duress`
In the new video, the masked jihadi militant, who is holding a gun, mocks Mr Cameron for daring to "challenge the might" of the extremist group before he makes a threat to British people to "invade your land".
The five men, wearing jumpsuits, are seen purportedly being shot in the back of the head in a desert location, after making what is claimed to be their confessions.
But BBC World Service Middle East editor Alan Johnston says they appear to be "speaking under the most extraordinary duress" and "may be entirely innocent".
One of the men says he had been asked to provide information about the location of IS militants, including two Britons, apparently to help target them with air strikes.
Some of the five men say that they are from Raqqa in Syria while another says he is from Benghazi, Libya, but none that they are from the UK.
After the apparent killings, the young boy, who seems to be aged around six or seven years old, is seen pointing into the distance, wearing military-style clothing. IS has repeatedly used children in its propaganda videos.
Islamic State video `shows killing of five men it says spied for UK`
04 January 2016
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