Keystone line to remain closed until corrective action taken

BISMARCK, N.D. -- Federal regulators have ordered the Keystone pipeline to remain shut down until its Canadian owner takes corrective action aimed at determining the cause of a breach that leaked an estimated 1.4 million litres of oil in northeastern North Dakota. The Pipeline and Hazardous Materials Safety Administration issued the order Tuesday to Calgary, Alberta-based TC Energy. The action comes one week after the pipeline leak was discovered and affected about 22,500 square feet (2,090 squa