A 14-year-old is being treated in hospital after he was stabbed in a classroom at his school in Leeds.
Police said the boy was stabbed three times with a knife at Allerton Grange High, at about 9.30am on Friday. He was taken to Leeds General Infirmary.
A 13-year-old boy has been arrested, and parts of the school have been cordoned off.
Lessons are still going on, and families are being reassured that their children are safe.
Worried parents gathered at the school gates as they heard the news about the stabbing.
School governor Richard Morris said in a statement that police officers were still at the school.
He said: "The school is calm, lessons are proceeding as normal and we can reassure families that it is a safe environment for their children.
"Our thoughts and hopes are focused on the young person in hospital."