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BISMARCK, N.D. — American Indian tribes trying to shut down the Dakota Access oil pipeline are objecting to the possible intervention of national energy and manufacturing trade groups in the legal dispute.

Attorneys for the Standing Rock and Cheyenne River Sioux tribes say in court documents filed Tuesday that the arguments of the trade groups are too lengthy and duplicate those already made by Texas-based pipeline developer Energy Transfer Partners and the Army Corps of Engineers, the federal agency that permitted the $3.8 billion pipeline which began moving North Dakota oil to Illinois about two months ago.

U.S. District Judge James Boasberg, in Washington, D.C., in June ordered the Corps to further review the pipeline's impact on the Standing Rock Sioux tribe, which has sued along with three other tribes over fears of environmental harm — a claim ETP rejects. Boasberg is deciding whether to shut down the pipeline while the work is completed.

The national trade groups seeking a say are the American Petroleum Institute, American Fuel and Petrochemical Manufacturers, Association of Oil Pipe Lines, national Chamber of Commerce and National Association of Manufacturers. They maintain in court documents that ceasing pipeline operations "would have serious adverse economic impacts throughout the oil industry and local and regional economies."