The facilities are located in every state, and are threatened by floods, hurricanes and wildfires that can cause dangerous leaks and explosions, according to a federal watchdog.
Coast Guard teams have been dispatched to help determine the extent of the damage from the spill, which is situated roughly two miles off the Louisiana coast. Officials say the source remains unclear.
Houthi rebels in Yemen have claimed responsibility for the attacks, but Secretary of State Mike Pompeo accused Iran of launching an "unprecedented attack on the world's energy supply."
