OKLAHOMA CITY (AP) - A federal appeals court has upheld a lower-court ruling that denied efforts to temporarily stop construction of what is intended to be the southern end of the Keystone XL pipeline and run from Oklahoma to refineries along the Gulf Coast.

The Sierra Club, Clean Energy Future of Oklahoma and the East Texas Sub Regional Planning Commission sued the Army Corps of Engineers, saying they shouldn’t have approved the project. They sought a preliminary injunction to stop TransCanada from constructing the pipeline while the lawsuit went through the court system, but a district court denied that request.

The 10th Circuit Court of Appeals on Wednesday upheld the district court’s ruling.

The 485-mile oil pipeline is to run from Cushing, Okla., to the Gulf Coast near Port Arthur, Texas.

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