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Thousands of people in Southern California still cannot go home, even after officials said they have backed away from what they called a potential catastrophic explosion at a chemical facility near Los Angeles
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About 16,000 people are still under evacuation orders around the GKN Aerospace Facility in Garden Grove, about 30 miles south of Los Angeles
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Officials say the worst-case scenario is now mitigated after crews spent days cooling an overheated chemical tank
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They're expected to reassess conditions again today. But the danger is not completely gone
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Authorities say a smaller explosion or a toxic release remain possible concerns
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The tank holds about 7,000 gallons of methyl methacrylate, or MMA, a chemical used to make plastics that can cause health problems with significant exposure
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Meanwhile, Orange County's district attorney has opened a criminal investigation to determine how the failure happened at the facility
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And California Governor Gavin Newsom says President Trump has signed an emergency declaration
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to expand federal support for the area
