Police in Germany after a gunman entered a school in Menden, Germany
Students and teachers were instructed by loudspeaker to lock their classrooms at around 11.15am local time (10.15am GMT).
Helicopters are now circling the area while sirens blare. Armed police have rushed to the scene.
Some pupils are communicating with family and friends using mobile phones, with one describing the scene was "scary".
It is scary here, police officers are everywhere
They said: "It is scary here, police officers are everywhere, helicopters… For nearly an hour already."
Police said armed officers had been deployed to the neighbourhood as they hunt the man.
Armed police in Menden, Germany, after reports of a gunman
Investigators now believe the man has left the school, called Hönne-Berufskolleg, and is on the run on the streets of the town.
A Twitter user said: "Possible armed man in school in #Menden, #Germany. Teachers and pupils got order to lock doors. Heavy police presence on the scene."
A police helicopter circling the area following reports of a gunman
The school, which has more than 2000 students and 100 teachers, is located in Menden, near Dortmund in west Germany.
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