The Canada wildfire burning out of control in Fort McMurray is expected to double in size within the next 24 hours, reaching the Saskatchewan province border later today.
The fire has already burned through 156,000 hectares, covering an area larger than New York City.
The only land convoy evacuating people has been suspended after flames lined the road.
The police road convoy of 1500 vehicles were meant to pass by the southern part of Fort McMurray, but this has been suspended.
More than 80,000 people have fled their homes in the city, with tens of thousands evacuated by air with 300 flights to the capital Edmonton since Tuesday, and another 4000 expected to leave on Saturday (local time).
No deaths or injuries have been reported.
However Alberta Premier Rachel Notley says a small number of residents are still in the city, despite gas, water and power services not working. She urges them to leave.
Firefighters are working "diligently and hard" and out-of-province fire teams have been brought in, says wildfire prevention and enforcement official Chad Morrisson.
The army are acting as air support. They have delivered food, and taken in First Nation evacuees from Fort McMurray.
They are undertaking night flights over the city to have a look at critical infrastructure, and have the ability to see through smoke.