A teacher has been stabbed at a Bradford school and a pupil is being hunted by detectives.
The male teacher, 50, was attacked at Dixons Kings Academy at 08:55 BST, police said.
He has been taken to hospital where his condition has been described as stable.
West Yorkshire Police are searching for a boy, 14, in connection with the attack.
He is described as Asian, with short dark hair and was last seen wearing a blue uniform blazer.
Det Supt Simon Atkinson: "We are conducting enquiries in the area to locate a suspect and I would like to reassure residents and staff that all necessary resources are being deployed to investigate this ongoing and clearly very serious incident."
A spokeswoman for the force said a "considerable" search was under way.
