TransCanada says that expects the pipeline to remain shut down as the company responds to the leak.
According to a press release from TransCanada, which operates the controversial pipeline, the section of pipeline was "completely isolated within 15 minutes and emergency response procedures were activated".
Western Canada Select heavy blend crude for December delivery was trading at $14.50 below the West Texas Intermediate benchmark at late afternoon on Thursday, down slightly from $14.20 the day before. The Keystone XL pipeline has been opposed by environmental and Native American groups since it was proposed a year ago.
Keystone pipeline leaks more than 200K gallons of oil
Amherst is about 200 miles north of Sioux Falls, S.D., and about 25 miles from the state's border with North Dakota. It was detected about 6 a.m. Thursday by TransCanada and reported to state officials more than four hours later, said Brian Walsh, a manager with the South Dakota Department of Environment and Natural Resources.
Keystone carries crude from the oil sands in Canada to refineries in IL and Texas, and to a distribution center in Oklahoma. That's the equivalent of 5,000 barrels of oil. TransCanada is providing state and federal regulators, including the Pipelines and Hazardous Materials Safety Administration and the National Response Center, with accurate and confirmed information on an ongoing basis.
A leak and spill in southeastern South Dakota in April 2016 prompted a weeklong shutdown of the pipeline. Based on the safety record of Keystone I, Nebraska's PSC should carefully consider the impacts of TransCanada's much larger Keystone XL pipeline as it weighs its decision on Monday.
Three dead in California school shooting
A series of shootings in rural northern California have left five people dead - including the gunman, authorities say. An official at the Corning Elementary School District confirmed the elementary school in Rancho Tehama is on lockdown.