West Yorkshire Police said the fatal stabbing of a teacher was "very much an isolated incident".
Chief Inspector Nik Adams, responsible for neighbourhood policing in the area, said, "This is not part of a wider problem that exists locally."
"This school has absolutely no issues in terms of weapons", he added.
Although a shocking attack, this is a rare attack. There are few other occasions when a teacher was stabbed inside their school by a pupil.
A 15-year-old schoolboy is in police custody tonight, suspected of stabbing to death his teacher.