Nine high school pupils were arrested after they were involved in a fierce fight in which two pupils were stabbed on KwaZulu-Natal's north coast, police said on Wednesday.

"Nine Mgwazini High School pupils were arrested on Tuesday after they were involved in a very serious fight," said Captain Jabulani Mdletshe.

"One pupil was stabbed in the back and the other one was stabbed in the face. They are being treated at Hlabisa hospital.?

It was unclear what caused the fight, he said.

The arrested pupils would appear in the Kwa-Msane Magistrate?s Court on Wednesday.

They have been charged with assault with intent to do grievous bodily harm.