A TEENAGER faces time behind bars after he stabbed another boy, who needed emergency surgery and has been left scarred.

The 17-year-old, who cannot be named for legal reasons, attacked the 16-year-old outside a school in the north of Glasgow last January.

Two of his 17-year-old friends joined him in assaulting the other teen, who was left with two stab wounds.

One punched and kicked him while the other brandished a Buckfast bottle during the sustained attack, which was all captured on a mobile phone and later discovered by police.

He admitted the attack at Glasgow Sheriff Court while his two friends denied their involvement, with one claiming self-defence because the 16-year-old victim kicked another of his friends.

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But, a jury convicted the two boys of acting with their friend and carrying out the assault to the victim’s severe injury and permanent disfigurement.

A fourth boy also pled guilty to engaging in a stand up fight with the victim’s brother.

The 16-year-old told the court he has been left with a scar at one injury and redness at the other.

He needed emergency surgery, a total of 26 stitches, internally and externally and was kept in hospital for six days.

The recording, later found on a mobile phone during police enquiries, captured the entire incident and showed the 17-year-old with a knife.

Before he used the weapon someone shouted “He’s got a lock back.”

Sheriff Paul Crozier deferred sentence on the teenagers until a later date and continued their bail.