An advocacy group in Nebraska said it was calling on U.S. regulators to shut down the Keystone oil pipeline following a spill from TransCanada’s system. “We cannot accept this continued endangerment of our land and water,” a statement from advocacy group Bold Nebraska read. TransCanada said about 400 barrels of oil spilled from the Keystone artery in South Dakota. The system was shut down briefly after the release was discovered April 2. According to the narrative provided by Bold Nebraska , an area farmer found the leak before TransCanada’s systems were triggered. According to the terms of an order from the federal Pipeline and Hazardous Materials Administration, the company restarted the pipeline during the weekend at a reduced rate. […]