An employee on a pump station heard what was described as a mechanical bang early Tuesday morning, an official told CBS News.

The Keystone Pipeline in North Dakota was shut down Tuesday after reports of a "bang" and spilled oil, according to officials ...

The latest leak in the Keystone oil pipeline in North Dakota on Tuesday continues the troubled history of the 15-year-old pipeline.

The cause of the rupture and the total volume of oil released after the North Dakota spill remain unclear, officials said.