Gunmen have killed two teachers and a police officer at a German school and barricaded themselves in a classroom with at least 20 students, police say. Six others at Gutenberg Gymnasium School in the eastern German city of Erfurt were were injured, a police spokesman told CNN. It is not clear whether they are adults or children, but one of them may be a gunman. The spokesman for Erfurt police said authorities believed one or two gunmen were still inside the building. He said it was believed disgruntled students may have carried out the shooting.

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