Authorities in Orange County say they’re unable to control the valves on a tank that contains methyl methacrylate, a chemical used in the manufacture of plexiglass.

About 40,000 people were under evacuation orders and schools shut down Friday in Southern California after a storage tank continued to leak a hazardous chemical that officials…

About 40,000 people are under evacuation orders and schools have shut down in Southern California due to a hazardous chemical leak.