A major blaze swept through a Canadian military base on Saturday, killing at least four people and leaving 19 people in critical condition.
Witnesses described the sight of dozens of people being rushed to hospital, mixed with the sound of soldiers yelling in agony, as being "like a scene from a war movie".
Prime Minister Mark Carney called it one of the worst peace-time tragedies on Canadian soil in the history of the military.
Here is what we know about the deadly incident so far.
The fire at Canadian Forces Base Wainwright broke out at around 16:00 local time (22:00 GMT).
Maj-Gen Wade Rutland, Commander of 1st Canadian Division, said a grass fire ignited on a training range 1km (0.6 miles) away, before "uncommonly strong winds caused it to spread rapidly" towards soldiers taking part in exercises.
"I spoke to my commander last night, and he said within 30 seconds to a minute they saw no fire, and then there was a fire right on top of them," Rutland said.
"It is not normal for a fire to move a kilometre in 30 to 60 seconds," he said.
The cause of the initial fire remains under investigation.
Earlier, local media reported it may have been started when a gas main was struck during a live firing exercise, but the military later said that investigators do not believe any explosions were caused by oil or gas infrastructure.
Carney described the fire as "violent" and "fast-moving".
The prime minister said military and civilian fire crews "fought this fire throughout the night in some of the worst conditions imaginable, risking their lives to protect their fellow Canadians".
The Canadian defence ministry has said the cause remains under investigation, and "at this time, there are no indications that it was the result of any terrorist activity".
Four service members are confirmed to have died, while a further 39 people are in hospital – 19 of whom are in critical condition.
Officials identified the deceased as Sgt Morgan Wong, Pte Shaun Farrell, Private Aidan Goulding and Pte Hayden Lykkemark.
Officials have not indicated whether or not the government expects the death toll to rise but said many people had suffered severe burns.
On Saturday evening, Royal Alexandra Hospital in Edmonton declared a code orange – a disaster response protocol for a high-casualty incident. It was stood down on Sunday afternoon.
Alberta's health service said the emergency response lasted for 10 hours, and involved 22 ambulances and eight aircraft.
Ongoing care for the injured is expected to be "intensive", a statement continued.
A stream of ambulances were seen arriving at the hospital and one doctor told Canadian public broadcaster CBC that the facility had been "completely overwhelmed" by the number of patients.
Brandon Simmons, a hospital resident receiving long-term care at the nearby Wainwright Health Centre, witnessed the aftermath of the fire.
He said he remembered seeing people with burns, while one person had their clothes "blown off" and was wearing only underwear.
In response to the incident, Minister of National Defence David McGuinty said: "Albertans are lining up to give blood."
Canadian Forces Base Wainwright is located in a rural area of the western province of Alberta – around 120 miles (193km) from Edmonton and 180 miles (290km) from Calgary, the province's two largest cities.
It is one of Canadian Army's busiest military training bases and its airfield is also used by the Royal Canadian Air Force.
It population fluctuates but more than 1,000 people can be based there at any given time.
Prime Minister Carney said military and emergency crews fought the flames throughout the night in "some of the worst conditions imaginable".
The Canadian prime minister is in Alberta for two days to make a final push for unity ahead of Monday’s separation referendum.
WATCH: The BBC's Nadine Yousif meets the separatists who want to quit the country – and the Canadians calling for unity in the face of threats from US President Trump.
Albertans vote this month on staying in Canada or moving ahead to a binding independence referendum.
The Parti Québécois, which secured a minority, has vowed to hold an independence referendum in the years to come.
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