Two pupils have been hospitalised today after a stabbing at Kingsdale Foundation School in Dulwich.
The police and London ambulance services were called at 3:30pm to reports of a stabbing at a school in Alleyn Park.
Two fifteen-year-old boys were discovered with knife wounds and were taken to hospital for treatment.
One is in a critical condition and the other boy is in a stable condition.
One teenager has been arrested in connection with the incident and has been taken to a south London police station.
The investigation is ongoing.