An estimated 3,500 barrels of crude oil spilled into an agricultural field in North Dakota after a Keystone Pipeline employee heard a "mechanical bang" from the system early Tuesday morning ...

An estimated 3,500 barrels of crude oil spilled into an agricultural field in North Dakota after a Keystone Pipeline employee heard a "mechanical bang" from the system early Tuesday morning ...

The affected segment of the Keystone pipeline system "has been isolated" and remains shut, the company said. The leak at Keystone is the largest oil leak since a Tesoro Corp. pipeline leak in ...