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The teenager, who cannot be named for legal reasons, was found guilty of committing violent disorder on 18 July last year, following a short trial at Leeds Youth Court earlier.

The court heard the boy, who cannot be named for legal reasons, was given a 12-month referral order after admitting violent disorder at Sheffield Youth Court.

Footage shown in the youth court hearing showed missiles including rocks, bricks, fireworks and petrol bombs being thrown at the police, and several cars set alight.

Harvey Willgoose died after being stabbed twice in the chest at All Saints Catholic High School, in Granville Road, at about 12:17 GMT on Monday, Sheffield Youth Court heard.

The boy, who cannot be named, is due to appear at Sheffield Youth Court later.