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A series of raging wildfires has forced mass evacuations of Canadian oil country and destroyed thousands of structures.
Photos: Canada wildfire
Jason Franson / AP
A helicopter flies past a wildfire in Fort McMurray, Alberta, on May 4, 2016. Alberta declared a state of emergency as crews frantically held back wind-whipped wildfires that have torched homes and other buildings in Canada’s main oil sands city of Fort McMurray. 
