The fire broke out around 16:00 local time on Saturday during live-fire training exercises at one of Canada's busiest military training bases, located about 210km east of Edmonton. Officials said the blaze is now contained and its cause remains under investigation, but there is no indication of terrorist activity or outside interference.
Maj-Gen Wade Rutland told reporters that infantry members were conducting 'high-intensity combat training with live munitions' at a grenade and attack range when a grass fire ignited approximately 1km away. 'Uncommonly strong winds caused the fire to spread rapidly and shift direction towards the range administrative area,' he said.
The deceased have been identified as Sgt Morgan Wong, Pte Shaun Farrell, Pte Aidan Goulding and Pte Hayden Lykkemark. Alberta Premier Danielle Smith said at least 19 of the 39 injured remain in critical condition.
Wainwright Mayor Bruce Pugh told the BBC he heard cannon fire from the base on Saturday before it suddenly stopped, and emergency services were later deployed to an 'all hands on deck' situation.
The fire overwhelmed local healthcare facilities. Dr Warren Thirsk told CBC that the number of patients had 'completely overwhelmed' Wainwright's health services. The provincial health agency deployed 30 units including ground and air ambulances, transferring patients to Edmonton and other facilities. A code orange disaster protocol was activated at Royal Alexandra Hospital but has since been stood down.
Brandon Simmons, a resident at the Wainwright Health Centre, told Reuters that nurses immediately began preparing stretchers and equipment, and that ambulances arrived 'throughout the night.' He described hearing people screaming inside vehicles, saying it was 'like a scene from a war movie.'
Prime Minister Carney said military and emergency crews fought the flames through the night in 'some of the worst conditions imaginable.'