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In this Oct. 4, 2012 file photo, large sections of pipe are shown in Sumner Texas. Safety regulators have quietly placed two extra conditions on construction of TransCanada Corp.’s Keystone XL oil pipeline after learning of potentially dangerous construction defects involving the pipeline’s southern leg. The new conditions were added four months after the pipeline safety agency sent TransCanada two warning letters about defects and other construction problems on the Keystone Gulf Coast Pipeline, which extends from Oklahoma to the Texas Gulf Coast. (AP Photo/Tony Gutierrez, file)