In the attack on several pupils at a school in Wuppertal, investigators assume the suspect ran amok, a police spokesman said on Thursday, suggesting the crime may have been a random, unprovoked episode. Four pupils at a school in the western German city of Wuppertal were injured, at least two of them seriously, in the attack. The suspected attacker, who is in custody, is believed to be a 17-year-old male pupil at the school. Police said the suspect was also injured in the incident.