New Islamic State video appears to show a 'British boy executing a prisoner'

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A new video from the so-called Islamic State (IS) shows a child - purportedly British - appearing to execute a prisoner.

Five boys stand in front of five men in orange jumpsuits in the video. The boy captioned as Abu Abdullah al-Britani (the Briton) is white.

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

 In this Tuesday, Jan. 19, 2016 file photo, Iraqi security forces celebrate as they hold a flag of the Islamic State group they captured in Ramadi, 70 miles (115 kilometers) west of Baghdad, Iraq. Iraqi security forces and the U.S.-led coalition say the government has regained full control of Ramadi after pushing Islamic State group fighters out of the city's outskirts.
Iraqi forces celebrate as they hold an Islamic State flag they captured in Ramadi, Iraq. (AP)

The other children are said to be 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, IS released a video purportedly showing a young British boy - thought to be four-year-old Isa Dare - blowing up a car and killing three prisoners inside.

He is the the son of Muslim extremist Grace "Khadija" Dare from Lewisham, south-east London, who travelled to Syria in 2012.