FILE - In this Oct. 5, 2016, file photo, heavy equipment is seen at a site where sections of the Dakota Access pipeline were being buried near the town of St. Anthony in Morton County, N.D. The Standing Rock Sioux is challenging new government conclusions that the $3.8 billion Dakota Access oil pipeline poses no significant environmental threats to American Indian tribes in the Dakotas. The Army Corps of Engineers in August finished more than a year of additional study ordered by a federal judge. (Tom Stromme/The Bismarck Tribune via AP, File)
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