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

Workers have recovered thousands of gallons of crude oil from an underground pipeline spill on North Dakota farmland.

Trucks and workers started a cleanup effort at the site of a spill of the Keystone oil pipeline in rural North Dakota ...

An estimated 3,500 barrels of oil spilled in a field near Fort Ransom, N.D., and the release was contained, the pipeline’s ...