A massive wildfire that has forced the evacuation of all 88,000 people from the western Canadian oil city of Fort McMurray and burned down 1,600 structures has the potential to destroy much of the town, authorities said on Wednesday.

With a few neighborhoods already in ruins, worsening fire conditions Wednesday pushed walls of flames towards thousands of more homes in the northeastern Alberta town, in the heart of Canada’s oil sands region.

Authorities said there had been no known casualties from the blaze itself, but fatalities were reported in at least one car crash among the evacuees. Thousands bunked down in arenas, hockey rinks and oil work camps, often short of fuel and food.

A wildfire moves towards the town of Anzac from Fort McMurray, Alberta., on Wednesday May 4, 2016. Alberta declared a state of emergency Wednesday as crews frantically held back wind-whipped wildfires. Unseasonably hot temperatures combined with dry conditions have transformed the boreal forest in much of Alberta into a tinder box. (Jason Franson/The Canadian Press via AP) A wildfire moves towards the town of Anzac from Fort McMurray, Alberta., on Wednesday May 4, 2016. Alberta declared a state of emergency Wednesday as crews frantically held back wind-whipped wildfires. Unseasonably hot temperatures combined with dry conditions have transformed the boreal forest in much of Alberta into a tinder box. (Jason Franson/The Canadian Press via AP)

A huge cloud of black smoke was visible from well over 60 km (37 miles) away from the town. Traffic on the main road headed south had thinned to a trickle, however, after major jams on Tuesday when the evacuation order was given.

WATCH VIDEO

Stretches of the highway had been converted into make-shift campgrounds by people in cars, trucks and recreation vehicles, who were fleeing the inferno.

Crews meanwhile had been unable to stop the fire, which has charred 18,500 acres (7,500 hectares) since it erupted on Sunday and exploded in ferocity.

A new school building in the heart of Fort McMurray had been destroyed and more than a dozen structures in residential parts of the town were on fire, according to the latest update issued by the emergency officials fighting the blaze late on Wednesday.

A helicopter flies past a wildfire in Fort McMurray, Alberta on Wednesday, May 4, 2016. Alberta declared a state of emergency Wednesday as crews frantically held back wind-whipped wildfires that have already torched homes and other buildings in Canada’s main oil sands city of Fort McMurray, forcing thousands of residents to flee. (Jason Franson /The Canadian Press via AP) A helicopter flies past a wildfire in Fort McMurray, Alberta on Wednesday, May 4, 2016. Alberta declared a state of emergency Wednesday as crews frantically held back wind-whipped wildfires that have already torched homes and other buildings in Canada’s main oil sands city of Fort McMurray, forcing thousands of residents to flee. (Jason Franson /The Canadian Press via AP)

“It is a possibility that we may lose a large portion of the town,” said Scott Long, an official with Alberta’s emergency management agency. Major oil sands facilities were not in the path of the flames, but companies’ efforts to help employees and evacuees and protect pipelines led to a decline in production.

Images from the neighborhood of Beacon Hill in the city’s southeast showed rows of charred house foundations, their upper stories burned to the ground, and blankets of white ash within. Officials said 80 percent of houses in the neighborhood, nearly 600 in total, were destroyed.

The regional government said two other neighborhoods, Abasand and Waterways, had sustained “serious loss.” Alberta Premier Rachel Notley said a total of about 1,600 structures have been destroyed in Fort McMurray.

“There are certainly areas within the city that have not been burned, but this fire will look for them and it will find them and it will want to take them,” said Chief Darby Allen of the Fort McMurray fire department.

The province declared a state of emergency for what was shaping up to be Canada’s costliest natural disaster.

Prime Minister Justin Trudeau said the military can deploy air force planes to the stricken city as needed. Fort McMurray International Airport suspended all commercial flights.

‘EXTREME WILDFIRE BEHAVIOR’

It was the second major blaze in the oil sands region in a year. Last May, wildfires led to the evacuation of hundreds of workers from the region, and a 9 percent cut in Alberta’s oil sands output.

The wildfire’s knock-on effects on oil sands operations escalated on Wednesday, with five companies including Suncor Energy and Husky Energy reporting reduced production either because workers had been affected by the evacuations or because of precautionary pipeline shutdowns.

Evacuees watch the wildfire near Fort McMurray, Alberta, on Wednesday, May 4, 2016. Alberta declared a state of emergency Wednesday as crews frantically held back wind-whipped wildfires. No injuries or fatalities have been reported. (Jason Franson/The Canadian Press via AP) Evacuees watch the wildfire near Fort McMurray, Alberta, on Wednesday, May 4, 2016. Alberta declared a state of emergency Wednesday as crews frantically held back wind-whipped wildfires. No injuries or fatalities have been reported. (Jason Franson/The Canadian Press via AP)

The impact on crude production volumes was not immediately clear, but Suncor said late on Wednesday it had shut its base plant operations – its largest oilsands mining site with a production capacity of 350,000 barrels of oil a day.

Its other thermal oilsands sites were operating at reduced levels.

Officials said very hot and dry conditions meant “extreme wildfire behavior” on all fronts around the fire. “We expect this fire to be going on and challenging firefighters to well into the evening,” said Chad Morrison, senior manager with Alberta’s Wildlife, Agriculture and Forestry.

The Canadian Red Cross said evacuees were calling the organization for help getting food and water.

A highway closure on Tuesday forced most evacuees to drive north, away from major cities. By Wednesday morning, the highway had reopened, but fuel had run out, stranding evacuees. Alberta’s transport department said it was escorting a fuel tanker north to help stranded drivers.

Twitter filled with offers of food, housing and animal care as worried evacuees asked officials and strangers alike about the status of their homes. Two babies were born at one evacuation center on Tuesday.

Wildfires were also raging in neighboring British Columbia on Wednesday, including a 9,000 hectare blaze in the province’s northeast that was threatening to spread across the border to Alberta, the B.C. Wildfire Service said.

📣 The Indian Express is now on Telegram. Click here to join our channel (@indianexpress) and stay updated with the latest headlines

For all the latest World News, download Indian Express App.