A wildfire reached the Canadian town of Jasper, Alberta on Wednesday, one of hundreds ravaging the western provinces of Alberta and British Columbia, as firefighters battled to save key facilities such as the Trans Mountain Pipeline, authorities said.

Wildfires burning uncontrolled across the region include 433 in British Columbia and 176 in Alberta, more than a dozen of them in the area of Fort McMurray, an oil sands hub.

The pipeline, which can carry 890,000 barrels per day of oil from Edmonton to Vancouver, runs through a national park in the Canadian Rockies near the picturesque tourist town, from which about 25,000 people were forced to evacuate on Tuesday.

“Firefighters ... are working to save as many structures as possible and protect critical infrastructure, including the wastewater treatment plant, communications facilities, the Trans Mountain Pipeline,” Parks Canada said in a post on Facebook.

The pipeline operator did not immediately respond to a Reuters request for comment but said earlier it was safely operating the pipeline and had deployed sprinkler protection as a preventive measure.

In the day’s last update, Jasper National Park said it could not report on the extent of damage to specific locations or neighbourhoods, and that it would provide further updates on Thursday.

Canadian Prime Minister Justin Trudeau said his government approved Alberta’s request for federal assistance.

“We’re deploying Canadian Armed Forces resources, evacuations support, and more emergency wildfire resources to the province immediately - and we’re coordinating firefighting and airlift assistance. Alberta, we’re with you.”

The town, and the park, which draws more than two million tourists a year, were evacuated on Monday night, at a time when officials estimated there were 15,000 visitors in the park.

Deteriorating air quality forced firefighters and others lacking breathing equipment to evacuate to the town of Hinton, about 100 km (62 miles) away, park authorities said on Facebook on Wednesday evening.

Officials of Parks Canada earlier said they expected rain to arrive overnight.