North Korea claims it tested a new nuclear weapons command-and-control system Monday, with the firing of projectiles carrying simulated nuclear warheads from multiple rocket launcher units. Leader Kim ...

The operator of the Keystone oil pipeline said it was moving to fully reactivate the system, ending a weekslong outage that pressured U.S. oil prices and complicated some Gulf Coast refiners’ ...

Nearly 14,000 barrels spilled into a creek. The Keystone pipeline system was shut down by operator TC Energy after an oil spill released an estimated 14,000 barrels into a creek in Washington County, ...