The Times of Israel reports: A video circulated on social media Tuesday depicts rebel fighters beheading a boy after capturing him north of Syria’s second city Aleppo, a monitor said.

In an earlier clip, the boy was sitting in the back of the truck with fighters around him accusing him of being a member of the Al-Quds Brigades, a Palestinian group fighting with the regime forces.

However, Al-Quds Brigades denied that he was one of its fighters.

The second video shows the boy lying in the back of a truck as a fighter begins to cut off his head with a small knife. The Britain-based Syrian Observatory for Human Rights confirmed that the video depicts rebel fighters.

Activists accused the Nurredin Zinki rebel group of carrying out the killing, but the group issued a statement condemning a “violation” and calling it “an individual mistake, that does not represent the general policy of the group.”

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