North Dakota state officials waited 12 days after learning of a major oil spill before publicly disclosing the incident, according to the Associated Press.
The spill, which resulted in the release of more than 20,000 barrels of oil, is one of the largest on record in North Dakota. It occurred because of a rupture in a below-ground oil pipeline.
According to Steve Jensen, a farmer who discovered the spill, oil was "spewing and bubbling 6 inches high."
Authorities say the leak has been fixed and oil has stopped flowing from the pipeline.