A 14-year-old boy who stabbed a Nigerian teacher, Vincent Uzomah, at a school in Bradfrd has been arrested on suspicion of attempted murder.
The suspect is believed to be of Asian origin.
The 50 year-old teacher, who is understood to be supply teacher, was attacked at Dixons Kings Academy at 08:55 BST.
He was stabbed once in the stomach with a knife during a science lesson but is in a stable condition, police said.
The teenager was arrested in the city centre following an extensive manhunt.
Det Supt Simon Atkinson, from West Yorkshire Police, said the teacher was attacked in front of other students.
“There were a number of pupils who witnessed this incident, which took place in a classroom, and they are currently liaising with specially trained officers who are obviously supporting them at this difficult time.
“This is believed to be an isolated incident and the police are continuing inquiries to establish the facts,” he said.
It is thought Mr Uzomah had only been working at the school for four weeks.
Police said his injuries are not life threatening and his family are at his bedside.
Executive principal of the Dixons Academy group, Nick Weller, said: “It happened right at the beginning of the school day and there were some students who witnessed it.
“Those students have been interviewed by the police. Obviously, it’s a very shocking thing for them to see.
“The general atmosphere in the school is very calm, quite orderly, we’re trying to keep to normal routines as much as possible.”
Mr Weller said there was nothing in school that suggested the attack was about to happen.
He added: “The police are looking into the lead up to this incident, there was nothing in school that led up to it.
“There may have been other people outside the school who maybe knew something.”
He confirmed the suspect has been a pupil at the school for a year.