Pipeline construction in Oklahoma

Continental Resources, one of the companies that has committed to ship crude on TransCanada's proposed Keystone XL pipeline, now says the controversial pipeline is no longer needed.

Continental has signed on to ship some 35,000 barrels of its own oil from the Bakken field of North Dakota on the 1,179-mile, $5.4-billion Keystone XL line. But construction of the pipeline has been delayed for years as TransCanada has sought regulatory approvals, and Continental has since turned to railroads to get its crude to oil refineries.