Crew members of a heavy lift helicopter helping with the Fort McMurray wildfire stand by their helicopter at a staging base near Conklin, Alberta, Saturday, May 7, 2016. Canadian officials feared the massive wildfire could double in size by the end of Saturday as they continue to evacuate residents of fire-ravaged Fort McMurray from work camps north of Alberta's oil sands city. (Photo by Jeff McIntosh/The Canadian Press via AP Photo)
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