Prime Minister David Cameron has paid his respects to the teacher stabbed to death in a Leeds school.
He said: "All our thoughts are with the teachers family, with the school, with all the pupils who study there. Everything that can be done to get to the bottom of what happened, will be done."
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.