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(CNN) Four people were killed and an alleged shooter was arrested Friday after gunfire erupted at a school in a small town in northern Saskatchewan, Chief Superintendent Maureen Levy of the Royal Canadian Mounted Police said Friday night.

Levy said authorities received a call about 1 p.m. Friday saying a weapon had been discharged at La Loche Community School in La Loche. Officers went to the school and at 1:47 p.m. arrested a suspect and seized his weapon.

Earlier reports said five people had been killed and two wounded.

Police were investigating at two sites, the school and a residence in the town, Levy said. The injured were taken to University Hospital in Saskatoon, she said.

Levy revealed few details and wouldn't give the names of the suspect or victims, whether the shooter and victims were students and what kind of weapon was used, saying the integrity of the investigation had to be protected.

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