A MAJOR police operation is underway at a German school after an armed person reportedly entered the building. The incident happened at Otto Hahn School in Jenfeld Hamburg, which is currently on lockdown while officers search the area. twitter @m_imuriAn armed person is said to have entered the building[/caption] Hamburg Police tweeted: “There is currently a major police operation at the Otto Hahn School in #Jenfeld . “The area around the school is closed.A youth armed with a gun is said to have entered the school building. “We will keep you informed here. It remains unclear if the armed person entered the school or was only passing by. The school building is currently being searched by special units as a precaution, cops said.