A total of 210,000 gallons of oil leaked Thursday from the Keystone pipeline in South Dakota, the pipelines operator, TransCanada, said. Crews shut down the pipeline Thursday morning and officials are investigating the cause of the leak, which occurred about 3 miles southeast of the town of Amherst, said Brian Walsh, a spokesman for the states Department of Environment and Natural Resources.
This is the largest Keystone oil spill to date in South Dakota, Walsh said. The leak comes just days before Nebraska officials announce a decision on whether the proposed Keystone XL Pipeline, a sister project, can move forward.