A 14-year-old boy has been charged after allegedly stabbing a fellow student in the hand during an attack at Lanyon High School on Thursday.

Police allege the boy approached another male student on school grounds about 10.20am and repeatedly punched him in the head.

He then allegedly pulled out a knife measuring between 20cm and 30cm, threatened the student and lunged at him, stabbing him in the hand.

Police say the boy also threw the knife at the student’s head as he fled before running from the scene himself.

The injured student was taken to hospital for treatment.

The 14-year-old attended City Police Station about 9pm, where he was arrested.

The boy, who was already subject to bail conditions, has been charged with intentionally wounding, assault occasioning actual bodily harm and possessing an offensive weapon with intent.

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