A gunman who at one point masqueraded as a policeman killed at least 16 people in the Canadian province of Nova Scotia during a 12-hour rampage, authorities said on Sunday, in what was the country's worst modern-era mass shooting. Among the victims of the shooting spree that spread across part of the Atlantic Canadian province was RCMP officer Heidi Stevenson, a 23-year veteran of the force with two children. 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.
