The Keystone oil pipeline has been shut down following a serious rupture that led to the spill of approximately 3,500 barrels of crude oil near Fort Ransom, North Dakota. This shutdown could potentially result in higher gasoline prices as the flow of Canadian oil into the U.S. is significantly disrupted. The incident follows a troubled history of leaks and failures associated with the pipeline, raising concerns among officials and environmental advocates. The owner, South Bow, confirmed the shutdown and is currently responding to the situation. Investigations are underway to assess the impact of this latest incident.