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The park is the world's only breeding ground for whooping cranes, as well as for billions of boreal songbirds.
Jason Franson/Canadian Press
Fire Chief Darby Allen says the emotional toll is hitting home for the crews who worked non-stop for days.
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"We would not do this if it was not safe to do so."
"This is a mass grave, in basements, in crates."
Police released tables and charts on Sunday that they say back up Chief Rod Knecht's claim.