The Sûreté du Québec has set up a perimeter and command post in Notre-Dame-des-Prairies. (Gabrielle Proulx/Radio-Canada - image credit)Quebec provincial police are investigating the deaths of three people in Notre-Dame-des-Prairies in the Lanaudière region. The deceased include a father and his two children, according to Sûreté du Québec spokesperson Catherine Bernard. Ianik Lamontagne, 46, and three-year-olds Antoine and Tristan were identified as the deceased, according to Radio-Canada sources. "As a society, we must also commit ourselves to preventing such events in the future," she said in a statement Sunday.