Kassel (dpa / lhe) – A student is said to have threatened violence at a school in Immenhausen (Kassel district), triggering a major police operation. As a precaution, emergency services brought teachers and students to safety on Tuesday afternoon, the police said. After about an hour, civilian investigators discovered the suspect boy outside the school and arrested him. “According to initial findings, there was actually no danger at any time,” the police said in a statement. The investigation into the student continues.