Last updated at 14:36
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Nasa releases satellite pics of Fort McMurray wildfire

A huge wildfire is spreading in the area of Alberta in Canada, where the government has declared a state of emergency.
One resident said: "It was something you'd see in a movie." Despite the size of the fire, no-one has been hurt.
Smoke clouds from the Alberta wildfireAP
Canadian astronaut Chris Hadfield tweeted this picture taken by Nasa. You can see how large the area that has been affected by the smoke is. "I hope all 90,000 folks are safe," he posted.
A satellite image of the Alberta wildfire shared by Chris HadfieldNASA
More than 100 firefighters have been brought in to help put out the flames. They have been using helicopters to try and stop the blaze.
Flames burningReuters
A massive cloud of smoke rises above trees near Fort McMurray. Around 1,600 buildings have been destroyed. Unusually hot and dry temperatures have created the ideal conditions for a wildfire.
Massive cloud of smoke rises above treesAP
This Nasa satellite image shows the huge clouds of smoke caused by a massive wildfire in the area of Alberta in Canada.
A satellite image of the Alberta wildfireNasa
Smoke from the fire has been blown for miles across the Canadian countryside and is even visible from the International Space Station.
A satellite image of the Alberta wildfireNasa
Here you can see several separate burning fires burning along the river. Nearly 90,000 people in the nearby city of Fort McMurray have had to leave their homes because of worries the blaze might reach there.
A satellite image of the Alberta wildfireNasa/Earth Observatory/Joshua Stevens