Canadian police charged a 17-year-old male with four counts of first-degree murder following a pair of shootings Friday in a remote aboriginal community in northern Saskatchewan.
The suspect was not identified, and police said Saturday that they had not determined a motive for the attacks.
A police spokesman said the youth also faced seven counts of attempted murder for shootings at a home and at a high school in the town of La Loche. The teen is expected to appear in court in the coming days.
Two of the dead were identified as teachers Marie Janvier and Adam Wood. Two brothers, ages 17 and 13, were also killed, apparently at the nearby home.
Bobby Cameron, chief of the Federation of Saskatchewan Indian Nations, said the shootings were the worst tragedy ever to hit the community.
Canadian Prime Minister Justin Trudeau called the shootings "every parent's worst nightmare."
In 2014, a teacher voiced concern about an unidentified student at the La Loche school. She said the student had tried to stab her, and she complained when he was placed back in her classroom after serving a 10-month jail term. In a separate incident, she said, another student tried to attack her at home.
It was not immediately clear whether either the attackers or the victim in the 2014 incidents were connected to Friday's violence.