Canadian officials are airlifting some 8,000 people who fled north of Fort McMurray – the city which has been devastated by a massive wildfire.
They also hope that the only motorway to the south will become safe on Friday to move the remaining 17,000 people, who are in danger of becoming trapped.
The entire city – more than 88,000 people – was evacuated three days ago. Some went north but most fled south.
The fire in the province of Alberta has grown to 850 sq km (328.2 sq miles).
Alberta Premier Rachel Notley warned city residents that they were facing a long wait before they would be able to return home.
The blaze has already destroyed more than 1,600 structures in Fort McMurray.
Most of those who fled north have been staying in oil sands work camps in the remote area.
About 4,000 of them have already been flown in military and civilian transport planes to Edmonton and Calgary and another 4,000 are expected to be rescued within hours.
The authorities hope that Highway 63, passing through Fort McMurray, will be safe on Friday to move the rest. A helicopter is expected to lead that evacuation convoy.
The evacuees are being moved again because urban areas in the south are better able to support the displaced, officials say.
“Our focus right now is on getting those people south as quickly as possible,” Ms Notley said.
“I must be very, very direct about this: it is apparent that the damage to the community of Fort McMurray is extensive and the city is not safe for residents.
On the prospect of returning to the city she said: “Unfortunately, we do know that it will not be a matter of days.”
The fire is growing in size due to high winds but it is “under control”, officials say.
The blaze started on Sunday in Canada’s oil sands region and many oil sands projects have cut production.
There are still no known casualties from the fire but there was at least one vehicle crash with fatalities on the evacuation route.
Scott Long of the Alberta Emergency Management Agency called the blaze “an extreme fire event” and said that rain would be needed to fight it.
Cooler temperatures and rain are forecast, giving hope that it could become easier to contain the blaze.
Wildfires in numbers
- 49 wildfires in total
- seven are ‘out of control’
- more than 1,100 firefighters
- 145 helicopters
- 138 pieces of heavy equipment
- 22 air tankers