Police arrested a suspect in a shooting that left four people dead in a small town in northern Saskatchewan, Canadian authorities said.

A call came in Friday afternoon about a shooting at a school in La Loche, said Maureen Levy, chief superintendent of the Royal Canadian Mounted Police.

Officers went to the La Loche Community School, arrested a suspect and seized his weapon, he said. In addition to the school, police are investigating a shooting at a residence in the town of about 2,600 people, Levy said.

"The country's heart is breaking," Canadian Prime Minister Justin Trudeau said after the shooting.