Over 20,600 barrels of oil fracked from the Bakken Shale has spilled from a Tesoro Logistics pipeline in Tioga, North Dakota in one of the biggest onshore oil spills in recent U.S. history.

Though the spill occurred on September 29, the U.S. National Response Center – tasked with responding to chemical and oil spills – did not make the report available until October 8 due to the ongoing government shutdown.