Zak Carney, 13, was left staggering with a bust nose and lumps and bumps on his head after he was punched repeatedly by an older boy
Now his mum Tracy is appealing for the person who filmed the assault to hand the footage into the police.
She said: “I received an anonymous message taunting me saying this person knew the attack had been filmed by a school pupil.
“The video could be the only thing that gets a result from this.
“The first I knew of the assault was when I got a phone call from Zak at 3.20pm on Friday saying he had been beaten up.
“A lady had stopped whilst he was staggering around and helped him. His nose had been bust wide open and he had cuts on his forehead and lumps and bumps on his head. He looked like the elephant man. He was taken to hospital and checked over. I believe this stems from an incident in school.”
The incident happened in an alley next to Farmfoods in Lancaster.
Zak said three boys followed him from Our Lady’s Catholic College and he ducked into Farmfoods to avoid them. But then he got trapped in the alley next to the shop and was attacked.
Tracy, who lives in Lancaster with son Zak, daughter Angel and husband Philip, runs a cafe in The Assembly Rooms inthe city.
Police are investigating.