TORONTO — A gunman opened fire at a high school and a second location in an aboriginal community in northern Saskatchewan, leaving four dead and at least two injured, officials said.

Prime Minister Justin Trudeau said from Davos, Switzerland, a suspect was in custody. Trudeau initially said five died in the shootings Friday, but police later corrected that to four.

“This is every parent’s worst nightmare,” he said. “The community is reeling.”

Kevin Janvier told The Associated Press his 23-year old daughter Marie, a teacher, was shot dead by the gunman. He said police told him the gunman first shot two of his siblings before killing his daughter.

“He shot two of his brothers at his home and made his way to the school,” he said.

“I’m just so sad.”

Marie was Janvier’s only child. He said he didn’t know if the shooter knew his daughter.