Firefighters trying to prevent an explosion in a tank of hazardous chemicals in Southern California found overnight that the failing tank was heating up internally despite efforts to cool it, the incident commander said on Saturday.

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…

Southern California officials have expanded an evacuation zone in several Orange County cities over a toxic chemical tank that they say is "actively in crisis."