A police officer wears a mask while controlling a roadblock near a wildfire in Fort McMurray, Alberta, Canada on Thursday, May 5, 2016. Raging wildfires in the Canadian province of Alberta have moved south, forcing three more communities to evacuate and an emergency operations center to move again , aking it far from the devastated oil sands city of Fort McMurray. (Jason Franson/The Canadian Press via AP) MANDATORY CREDIT