A Scottish schoolboy was stabbed to death during a fight with another teen that began over a biscuit a court has heard.

Bailey Gwynne, 16, died after being stabbed in the heart during a fight at Cults Academy in Aberdeen in October last year. Another 16-year-old went on trial accused of his murder on March 1, 2016.

According to the Independent a witness said the fight started after an argument when Bailey refused to give another boy some biscuits. The pair began punching each other before the other boy pulled a knife from his pocket.

Alasdair Sharp, 28, was the first teacher on the scene but did not initially realise the seriousness of the situation. He separated the pair and led them towards an office.

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He then noticed Bailey staggering towards the wall and said he had become "very pale" and "there was a lot of blood coming out of him".

The court also heard from the head teacher Anna Muirhead who described how she saw the accused sitting nearby in a "distraught" state. When she tried to speak to him he said: "Just take me to the police."

A knife was recovered from a recycling bin at the school.

The accused denies murder as well as being in possession of knives or bladed instruments and two knuckledusters at the school between August 1 2013 and the day of Bailey's death.

The trial continues.

- nzherald.co.nz