The workers had been missing since Monday's fiery blast. Sixteen other workers escaped. Investigators are working to determine how the explosion occurred.
At the same time, a new Interior Department plan designated nearly 10 million acres in Alaska as off-limits to any future oil and gas leasing. Reaction has been mixed to the draft plan.
Faulty gear and attempts to clear liquid from wells can release enough gas to power hundreds of homes, new research reveals. Scientists say finding the leaks is a first step to plugging them.