Bismarck, N.D. (AP) Cleanup continues around-the-clock and one year after a pipeline break spilled more than 20,000 barrels of oil in a farmer's field in northwestern North Dakota.
The massive spill from a Tesoro pipeline was discovered by a Tioga farmer last autumn. The spill has been called the worst in state history.
Tesoro and the State Health Department say it may be at least another year before the cleanup is completed. Only about 6,000 barrels of oil have been recovered in the past year.
Tesoro blames a lightning strike for causing the rupture.
The company originally estimated the cleanup cost at $4 million. The cost is now pegged at more than $20 million.