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; BBC reported.

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