The grotesque nine-minute video is believed to have been recorded recently in the capital of Raqqa, in Syria, and shows the organisation is becoming even more brutal as it retreats into its heartland.
The children appear to be about 10 to 13 years old and the boy captioned as Abu Abdullah al-Britani is white with blue eyes.
The other executioners are Egyptian, Kurdish, Tunisian and Uzbek according to captions of the video shot.
One of the boys reportedly shouts in Arabic, “No one can save the Kurds even with the support of America, France, Britain, Germany, the devils in hell.”
The child is pictured in full military fatigues and a black hat alongside four other boys, and the prisoners are wearing orange jump suits.
