GENEVA — A gunman injured several people in Switzerland’s largest city, and the suspect remained at large, a Zurich police official said Monday.

Police were swarming to the scene in pursuit of the attacker, the official said on condition of anonymity because he was not authorized to speak publicly about the matter.

The SDA news agency reported that the victims were adults who were outside near an Islamic center. Police said was unclear whether the attack had anything to do with the location.

Police told German-language daily Blick that three people had been injured, and the suspect had fled the scene.

Attacks by gunmen are rare in Switzerland.