Former UFC champion Quinton “Rampage” Jackson has apologized and said that he is “very upset” after his son allegedly committed what organizers called “a selfish, irresponsible act of violence” against a wrestler during an event Saturday night in Sun Valley, California.

Footage from the event posted on social media showed Jackson’s son, Raja Jackson – a professional MMA fighter – sliding into the ring during another bout and throwing Syko Stu, whose real name is Stuart Smith, to the mat.

The video, which bears a watermark suggesting it was livestreamed on the video platform Kick, showed Jackson straddling Smith before repeatedly punching him in the face and the side of his head, even when Smith was lying motionless. Other wrestlers then restrained Jackson.

CNN has not been able to

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