A gunman in Canada has killed at least 16 people - in the country's worst ever mass-shooting.

The 51-year-old went on a 12-hour rampage across northern Nova Scotia. It's reported he was then shot dead.

The suspected gunman was dressed as a police officer and had disguised his car to look like a police vehicle.

One of those killed was Heidi Stevenson, a 23-year veteran of the Royal Canadian Mounted Police and a married mother of two.

A second officer was injured.