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

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

BISMARCK — The operator of a portion of the Keystone pipeline that runs through North Dakota estimates about 3,500 barrels, or 147,000 gallons, of crude oil spilled into a field near Fort Ransom Tuesday, April 8, after a pipeline malfunction.