Forced to lie side-by-side and with their faces in the dirt, the video shows about 200 young children stretched out in a long line to the left and right.
Behind them, at least a dozen gunmen armed with assault rifles and handguns stand poised and ready to fire.
The video is believed to have been filmed somewhere inside Syria, where ISIS control a swathe of territory, including Raqqa, the capital of the terrorists’ self-proclaimed caliphate.
While ISIS is notorious for mass executions, there have been few reports of the militants targeting such a large group of children exclusively.
Although it lasts less than 30 seconds, almost all of the video is too graphic to broadcast unedited. It was not clear what the children were accused of in order to be sentenced to death.