The so-called Islamic State (IS) militant group has released a video which purportedly features a British boy, appearing to execute a prisoner.

The video reportedly shows five young boys standing in front of five men in orange jumpsuits before shooting them dead.

The boy which the group identifies as the Briton is captioned as Abu Abdullah al-Britani and is white.

A child referred to as Abu al-Bara al-Tunisi (the Tunisian) addresses the men - apparently Kurdish fighters - promising more violence, according to the BBC.

The other children are captioned Abu Ishaq al-Masri (the Egyptian), Abu Fu'ad al-Kurdi (the Kurd) and Yusuf al-Uzbaki (the Uzbek).

The identity of the child said to be British has not been verified.

Children have featured prominently in IS propaganda. In February, the group released a video purportedly showing a young British boy blowing up a car and killing three prisoners inside.