Three teenage boys have been banned from entering Wandsworth for three years and given youth rehabilitation orders after they were found guilty of violent disorder following a stabbing in Southfields Academy.

The offences crossed the custody threshold but the boys were spared an immediate jail term.

A 17-year-old from Coddington, Nottinghamshire, a 15-year-old from Tooting and a second 17-year-old from Mitcham, were all charged with violent disorder after a 15-year-old was stabbed in the leg inside the school in Merton Road on November 10 last year.

A jury heard how the group stormed into the school and one brandished a knife before another stabbed the boy.

November 10: UPDATED: Stabbing inside Southfields Academy

February 25: Southfields Academy stabbing: Four teenagers to appear in Kingston Crown Court next month

The Nottingham boy was also found guilty of unlawful and malicious wounding, for the stabbing. He had previously admitted possession of a knife in the school on the day.

The 15-year-old was found guilty of knife possession in the school.

The victim was in hospital for two days.

Wandsworth Times:

A fourth teenager, aged 15 from Twickenham, was cleared by the jury.

Sentencing, Judge Judith Coello said: "I have no doubt that this event resulted from a long term dispute between your group and his [the victim's]."

She told the Nottingham teenager: "You were on a mission of some kind of revenge attack or retribution.

"When you spotted him, after a few words were exchanged you all rushed into the reception area.

"It is very evident that this was an attack where you acted together."

She told him she rejected his version of events heard in defence that he had been acting in self-defence when he stabbed the victim.

She said: "You have accepted full responsibility for what you did and I accept that you are remorseful.

"You should be grateful for having the support of your mother and her partner.

"You are intelligent and capable of gaining a good education and making a positive contribution to society."

She told him he was making positive improvements since he moved to a more rural community in Nottinghamshire.

In contrast she had strong words for the 15-year-old: "You are not facing up to the responsibility of what you did on this occasion and there is little evidence you have a desire to change.

"Knives are becoming part of your day to day existence and there is a real danger something really serious will happen to you or someone else.

"Your behaviour is deeply disturbing."

Judge Coello criticised the Tooting boy for failing to return for sentencing with a clean record, having been arrested while on bail.

She told the final 17-year-old: "You are still denying responsibility for your part in the violent disorder.

"You do not fully appreciate the impact of what you did together with the others on that day."

The 17-year-old from Nottingham and the 15-year-old were both given two year youth rehabilitation orders with supervision requirements and electronically monitored tagged curfews for 90 days.

The Nottingham teenager was also ordered to complete 100 hours of unpaid work.

The 15-year-old was given additional requirements of knife crime prevention programmes and activity requirements.

The Mitcham teenager was given an 18 month youth rehabilitation order, with supervision, and a 90 day curfew with an electronic tag.

He was also given an activity requirement as part of his order.

All three were banned from Wandsworth, ordered not to contact each other or any prosecution witnesses and ordered not to be in possession of a knife or bladed article in public for three years.