01/23/2016 08:14 EST | Updated 01/23/2017 05:12 EST

La Loche Shooting: A Timeline Of Events

Four people were killed and seven others were injured in a mass shooting Friday.

LA LOCHE, Sask. — Four people were killed and seven others were injured in a mass shooting Friday at a school and home in the northern Saskatchewan community of La Loche. A 17-year-old has been charged with murder and attempted murder. Here is a timeline of events:

Before 1 p.m. — Two teen brothers are gunned down in a home on in the 300 block of Dene Crescent. There is a chilling exchange between friends chatting online. "Just killed 2 ppl," a young man wrote to his friends. "Bout to shoot ip the school."

Shortly after 1 p.m. — Police begin receiving calls from frantic students and teachers saying there is a shooter in the school. Students, just returning from lunch, flee for their lives. Some run for the doors, others hide in gym dressing rooms for several hours.

Between 1:08 p.m. and 1:10 p.m. — Police begin arriving at the school. Officers see the outside door has been shot. They see a shooter inside and chase him deeper into the school.

1:15 p.m. — Police challenge the shooter and he surrenders without negotiation or incident. Officers find nine people shot. Teacher's aide Maria Janvier, 21, is dead at the scene. Teacher Adam Wood, 35, is rushed to hospital, but cannot be saved.

After 1:15 p.m. — Police receive a call about a body in a house. They rush to the Dene Crescent home and find Drayden Fontaine, 13, and Dayne Fontaine, 17, dead.

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