BISMARCK, N.D. (AP) — The Standing Rock Sioux has requested a hearing on a plan by the developer of the Dakota Access Pipeline to double the line’s capacity. Tribal Chairman Mike Faith says in a letter to state regulators that doubling the pipeline’s capacity increases the “consequences as well as the likelihood” of an oil spill.

State regulators agreed last month to consider a hearing if one was formally requested. The tribe was the first to submit a request. The Sierra Club says it also will file a request by the Friday deadline.

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Energy Transfer announced in June it plans to expand the pipeline’s capacity from more than 500,000 barrels per day to as much as 1.1 million barrels.

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The pipeline sparked massive protests in North Dakota before it began moving oil in 2017.

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