A 17-year-old student has been arrested on suspicion of stabbing his teacher to death at a college in western Germany on Tuesday, police said.
The teacher, a 55-year-old woman, was alone in a classroom at the vocational college in Ibbenbueren when the knife attack happened, according to police in the city of Muenster.
The student called emergency services and did not resist arrest, police said.
Muenster police are carrying out an investigation.
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