BISMARCK, N.D. (AP) — The nearly 2,700-mile Keystone oil pipeline was shut down Tuesday morning after it ruptured in North Dakota, halting the flow of millions of gallons of crude oil from Canada to refineries in the U.S. and potentially leading to higher gasoline prices. It wasn’t clear what caused the rupture of the underground pipeline Tuesday morning or the amount of crude oil released into the field. Officials say an employee working at the site near Fort Ransom heard a “mechanical bang” and shut down the pipeline within about two minutes. Oil surfaced about 300 yards south of the pump station in a field. An energy analyst says the pipeline’s shutdown could quickly lead to higher gasoline prices in the Midwest.
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