In the German city of Wuppertal, a teenager attacked his classmates with a knife, injuring at least four people.
Report informs via Bild that the incident occurred in one of the gymnasiums; for unknown reasons, a teenager attacked his classmates with a knife.
According to preliminary data, at least 4 students were injured.
Law enforcement officers managed to detain the attacker, the reasons for the incident are being clarified.
