Once again, the dog has gone on a rampage.

Seventeen people were killed in the mass shooting rampage.

The death toll in Sunday's 12-hour shooting rampage across the province of Nova Scotia, already the worst of its kind in Canada's history, has risen to 18.

In Nova Scotia, a gunman disguised as a police officer went on a 12-hour rampage shooting people in their homes, setting fires and killing at least 18 people, including a 23-year-veteran policewoman.