Southern California officials have expanded evacuations in several Orange County cities due to concerns over a leaking toxic chemical tank that they say is "actively in crisis."

There is no longer a threat of explosion at a tank filled with a toxic chemical at the GKN Aerospace facility in Garden Grove, officials says Monday.

Nearly 40,000 people have been evacuated as emergency officials work to cool the tank and mitigate any possible harm.

California crews conducted an overnight operation at the Orange County site of a chemical leak in Garden Grove and said Monday that the threat of a massive explosion had been "eliminated."

Tens of thousands remain evacuated as emergency crews try to secure a tank loaded with 7,000 gallons of methyl methacrylate at an aerospace plastics facility in Orange County.

We are not there yet,” Interim OCA fire chief TJ McGovern told the public. “Please help us. Stay out of the evacuation zone. Let us run our operation.”

Following an unprecedented multi-day hazardous materials emergency that triggered widespread mandatory evacuation orders across six Orange County municipalities, the nationally recognized law firm of Karns & Karns Personal Injury and Accident Attorneys has officially launched an independent toxic tort investigation into the safety and operational protocols of the GKN Aerospace manufacturing plant located on Western Avenue in Garden Grove.