A U.S. environmental group called for a closer look into the Keystone XL pipeline, though supporters said it's another stalling tactic for the project.

A Texas judge last week lifted a restraining order for construction of the Gulf Coast project, the U.S. leg of the planned Keystone XL pipeline. A landowner accused TransCanada, the company planning the pipeline, of offering misleading information about the type of crude oil designated for the project.

Keystone XL would carry so-called tar sands oil, a type of crude seen as more corrosive and more environmentally harmful than conventional crude oil.

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