The Keystone Pipeline was shut down in some parts of the country after more than 200,000 gallons of oil leaked in South Dakota, according to officials. TransCanada, which operates the pipeline that runs from Canada to Texas, said it shut down parts of the pipeline after it detected a decrease in pressure overnight. The company did not say what caused the pressure to drop. A South Dakota state environmental official told NBC News that the affected area was agricultural, and that the oil has not reached bodies of water.
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