A teenage boy has been taken to hospital for treatment following a stabbing incident at Larne Grammar School.
It happened this morning just before 11:30am (Tuesday).
A 13-year-old boy has been arrested on suspicion of grievous bodily harm and possession of an offensive weapon and is currently in police custody.
The Northern Ireland Ambulance Service said it received an emergency call from the school at 11:21am.
The injured boy was taken to the Royal Hospital where his condition is not believed to be life threatening.