Payne County, Oklahoma

Major US energy companies including Plains All American Pipeline, Hess Corp and Kinder Morgan Inc are among many seeking exemptions from steel-import tariffs as the United States ratchets up trade tensions with exporters including China, Canada and Mexico.

The governor of California declared an emergency as crews scrambled to contain an oil slick and clean up popular beaches after a pipeline rupture dumped thousands of gallons of oil into the ocean.