A stabbing at a Co Antrim grammar school has left a teenage pupil in hospital.
His injuries are not life-threatening, police said.
It happened at Larne Grammar School on Tuesday morning.
A PSNI statement said: "A 13-year-old male pupil has been arrested on suspicion of grievous bodily harm and possession of an offensive weapon and is currently in police custody."
The pupil was taken to the Royal Belfast Hospital for Sick Children.
The school declined to offer immediate comment.
The Northern Ireland Ambulance Service said it received an emergency call at 11.21am.
One crew attended the scene on the Lower Cairncastle Road and a teenager was taken to hospital.
