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TransCanada Corporation Keystone pipeline worksite. (CBC news photo Twitter)

TransCanada Corporation announced its original Keystone pipeline leaked an estimated 210,000 gallons of oil in Marshall County, South Dakota. The news comes just days before Nebraska decides the fate of plans to expand the pipeline network.

The company said crews shut down the Keystone pipeline system Thursday morning between Hardisty, Alberta, Canada and Cushing, Oklahoma, and a line to Patoka, Illinois. They expect the line to remain shut down while they respond to the spill.

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