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A thug wearing a knuckle duster stamped on a defenceless schoolboy's head as he lay on the ground after a brutal attack.
The shocking footage of the incident shows a huge group following two brawling boys , one half naked and another wearing a white shirt and black tie.
Shouts of “f*** him up” and “make him pass out” can be heard as the crowd tries to urge on one of the two.
The two continue to fight until another young man without a shirt hits the school pupil from behind as the other attacks from the front.
The incident quickly escalates towards the end of the video as several people are seen kicking the school pupil after he appears to fall to the ground.
The end also reveals the youth, who stamped on the boy’s head, appears to have a knuckle duster on his hand.
Facebook page Scumhunter Doncaster posted the video to followers, where it has been viewed over 650,000 times.
It is unclear when the footage was filmed but the page cites Hyde Park as the area the group are from.
South Yorkshire Police have been contacted regarding the footage.