The tragic incident took place in the village of Tomislawice after 11 p.m. (2100 GMT) at night. Five of the injured were sent to hospital, and the rest received medical treatment at the scene, the Polish Press Agency quoted local police and the prosecutor's office as saying.

The 19-year-old perpetrator had been detained by the police, it said.

The police were working at the scene under the supervision of the prosecutor to determine the perpetrator's motives and the course of the incident, it added.

(With UNI inputs)