Emergency officials are racing to mitigate a Garden Grove chemical tank crisis as thousands remain under evacuation orders.

California crews conducted an overnight operation at the site of a chemical leak in Orange County and said Monday that the threat of an explosion is "off the table."

Firefighters contending with a dangerously overheating industrial tank of a hazardous chemical in Southern California have eliminated the possibility of the tank exploding after a crack relieved some of the mounting pressure, they said on Monday.

Authorities are trying to tamp down the risk of a possible explosion or leak of a damaged chemical tank at a facility in Southern California.

Newsom said the state is 'mobilizing every resource available' after more than 40,000 residents were ordered to evacuate Orange County.