Overview
- Fire crews are working to contain a large blaze at the Valero refinery after an explosion sent thick smoke over Port Arthur.
- The mayor told residents to shelter in place until emergency teams give the all-clear.
- The police chief said a defective industrial heater likely sparked the explosion.
- The police chief also said there were no reported injuries.
- State environmental regulators opened an investigation into whether the fire released harmful pollutants into the air.