A 15-year-old boy has been stabbed at Beckfoot Thornton School in Bradford.
The teenager was stabbed in the shoulder just before 12pm today.
He was taken to hospital for treatment but his injuries are not thought to be life-threatening.
West Yorkshire Police said a male of similar age had been arrested and a knife had been recovered from the scene.
The Headteacher, Mr J Richardson, at Beckfoot Thornton School in Bradford said:
There has been an incident at school today in which one of our students has been injured. The student is with his family and receiving the necessary medical attention. Another of our students is with the police and they have started a detailed investigation.