Enbridge shuts U.S. oil pipeline after fire, spill CALGARY, Alberta (Reuters) - Enbridge Inc said on Saturday it shut down an oil pipeline on its Canada-United States export system for an undetermined period when a fire at an Illinois pumping station was ignited by a deadly vehicle accident. Enbridge, whose network carries the bulk of Canadian oil exports to the U.S. Midwest and Midcontinent regions, said it was forced to shut down the 318,000 barrel-a-day pipeline between Superior, Wisconsin, and Griffith, Indiana, known as 14/64, after the early-morning collision caused a blaze and a spill of crude near New Lenox, Illinois. The Chicago Sun-Times reported two men were killed, including a firefighter, and three critically injured in the accident. Enbridge did not provide an estimate of the amount of spilled crude. "An estimated startup time is not known at this time," Enbridge spokeswoman Lorraine Little said in an email. An update will be provided when local emergency crews and Enbridge are able to assess the extent of the damage. It was the second time in less than three weeks that the company had to shut down part of its system in the Upper Midwest because of a leak. On February 16, it turned off its 491,000 barrel a day Line 5 for about a day after discovering a small amount of spilled oil in Michigan's Lower Peninsula. Tight pipeline capacity has been a major factor in deep discounts for Canadian crude oil in recent months. Enbridge said emergency crews had contained the Illinois fire. The vehicle accident in New Lenox, 40 miles southwest of Chicago, was unrelated to its operations, it said. Early on Saturday it shut another major line between Superior and Griffith, called 6 A, as a precaution, but restarted it several hours later. The company has also slowed the flow of oil in two pipelines in Canada, Lines 2B and 3, which feed supply into the system at Superior, it said. Reporting by Jeffrey Jones; Editing by Philip Barbara