Four military members were killed and 39 others were injured at the Canadian Forces Base in Wainwright after a “rapidly spreading” wildfire on Saturday, government officials confirmed on Sunday.

Maj. Gen. Wade Rutland, who oversees the headquarters of the unit that was training at the base, said the fatalities occurred after military members responded to a fire on the base during a live-fire training exercise. “Uncommonly” strong winds then caused the fire to spread quickly and change direction toward the base’s administrative area.

“The fire was a kilometer away when the wind shifted,” Rutland said at a press conference on Sunday. “That is not normal for a fire to move a kilometer in 36 seconds.”

Officials did not share a confirmed or expected cause of the fire, saying details were under investigation. Care for injured military members was initially expected to strain local health care resources, but Sayeh Zielke, interim CEO of Acute Care Alberta, said there are 43 ICU spaces available across the province’s health system, along with additional capacity actively being created.

The Canadian government confirmed the identities of those killed as:

• Sergeant Morgan Wong, from the Loyal Edmonton Regiment based at Edmonton, Alberta, serving with 3rd Battalion, Princess Patricia’s Canadian Light Infantry
• Private Shaun Farrell, from 3rd Battalion, Princess Patricia’s Canadian Light Infantry, based at Edmonton, Alberta
• Private Aidan Goulding, from 3rd Battalion, Princess Patricia’s Canadian Light Infantry, based at Edmonton, Alberta
• Private Hayden Lykkemark, from 3rd Battalion, Princess Patricia’s Canadian Light Infantry, based at Edmonton, Alberta

Zielke said 19 of the military members who were injured were in critical condition, eight were stable, and 12 were receiving treatment for less serious injuries.