Four pupils at a school in the western German city of Wuppertal were injured, at least two of them seriously, in an attack on Thursday, according to police and officials. The suspected attacker, who is in custody, is believed to be a 17-year-old male pupil at the school, said Herbert Reul, the interior minister of the state of North Rhine Westphalia, which includes Wuppertal. Police said the suspect was also injured in the incident. Reul confirmed the weapon used but said nothing is yet known about the motive. He said it is currently assumed that the suspect was a lone perpetrator. One pupil t…