The Royal Canadian Mounted Police said the gunman, 51-year-old Gabriel Wortman, who worked as a denturist, appeared at one stage to have been wearing part of a police uniform. He had also painstakingly disguised his car to look like a police cruiser.
Police added they had ended the threat posed by Wortman, who was dead, but would not confirm a report by the CTV network that the RCMP had shot him.
Wortman shot people in several locations in Nova Scotia, the RCMP told a briefing. RCMP Commissioner Brenda Lucki told the Canadian Broadcasting Corp the police knew of at least 16 victims, besides the shooter.