An armed attacker has been reported in Heinrich-Böll-Gesamtschule school located at Chorweiler district of Cologne, Germany. After the report, a large number of police officers were deployed to the school. Upon arriving, police officers have launched a large scale searching operation in the school perimeter as well as in the school building. Students and teachers were evacuated from the school building class by class, after the security measures were taken. Meanwhile, a communication point have been were set up for the students’ parents who were waiting worriedly around the school.