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On Terror Alert: Inside Big Oil’s Fight to Build Keystone

Workers inspect a weld on the joint between two sections of pipe on a Gulf Coast Project pipeline in Atoka, Oklahoma.

Workers inspect a weld on the joint between two sections of pipe on a Gulf Coast Project pipeline in Atoka, Oklahoma.

Photographer: Daniel Acker/Bloomberg

The intelligence was alarming: homegrown extremists were said to be targeting the Keystone XL pipeline.

It was April 2013, and environmentalists had joined together in opposition to the 1,700-mile (2,735-kilometer) Keystone system, which connects the oil sands of Alberta to refineries in the U.S.