A 14-year-old boy has been arrested on suspicion of attempted murder following a stabbing at a school in Bradford, Detective Superintendent Simon Atkinson, of West Yorkshire Police said.
The 50-year-old male teacher was taken to hospital from the Dixons Kings Academy in Bradford for treatment to a stab wound to his body. His condition was described as stable.
Detective Superintendent Simon Atkinson, of West Yorkshire Police's homicide and major enquiry team, described it as a "very serious incident".
The boy is described as Asian, with short dark hair. He was last seen wearing a blue uniform blazer.
Police were called in at around 8.55am by an ambulance crew responding to a report of a member of staff having been stabbed.
The teacher had suffered a stab wound to his body, West Yorkshire Police said.
In a statement on its website, the school said: "There has been an incident at Dixons Kings Academy this morning. The police and the academy are working together to investigate the incident.
"There is currently no ongoing risk to pupils or staff at the school. The school is continuing to operate as normal and police officers, including safer schools officers, are on site to support staff and students."
The attack comes a year after teacher Ann Maguire, 61, was stabbed to death by one of her pupils in a murder that shocked the country.
Will Cornick stabbed Mrs Maguire seven times from behind as she taught a Spanish class at Corpus Christi Catholic College in Leeds on April 28 last year.
Cornick, who was 15 at the time, boasted to his friends he was going to kill her and winked to his classmate before he launched into the attack.
After the killing he told psychiatrists he ''couldn't give a s***'' and added: ''Everything I've done is fine and dandy.''
The murder was branded a "monumental act of cowardice and evil" and Cornick was sentenced to a minimum of 20 years in prison before he is considered for release. But the judge, Mr Justice Coulson, warned him: ''It's quite possible that day may never come.''The 50-year-old male teacher was taken to hospital from the Dixons Kings Academy in Bradford for treatment to a stab wound to his body. His condition was described as stable.