Bonn (dpa / lnw) - Amok alarm was triggered at a comprehensive school in Bonn on Wednesday. Police searched the building but found nothing suspicious, a spokesman said. No one noticed any suspicious people or noises. According to previous investigations, an automated loudspeaker announcement in the school in the morning pointed to an amok alarm. A large contingent of police then drove to the scene. The students, who had locked themselves in their classrooms, were able to leave the building after the search was completed. It was not immediately known how the alarm was triggered.