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

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

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

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.

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

The environmental group Greenpeace has been ordered by a North Dakota jury to pay more than $660 million in connection with protests against the Dakota Access oil pipeline’s construction.