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Overheating chemicals tank in California no longer at risk of exploding, fire officials say

  • Late Monday, Orange County officials reduced the evacuation zone 65% around GKN Aerospace plant after declaring the threat of a boiling liquid expanding vapor explosion eliminated as crews worked overnight.
  • Roughly 50,000 residents evacuated Thursday after the tank overheated; a crack discovered Sunday relieved pressure, and overnight cooling reduced temperatures from 100 to 93 degrees F.
  • An overnight evaluation of the tank containing 6,000 to 7,000 gallons of methyl methacrylate produced 'incredibly positive news,' Incident Commander Craig Covey said Monday during a press conference.
  • Residents outside the new boundaries were cleared to return home, though roughly 16,000 remained under evacuation orders in Garden Grove and five nearby cities as Governor Gavin Newsom praised federal emergency assistance.
  • Purdue University engineering professor Andrew Whelton cautioned that temperatures must fall closer to ambient levels of roughly 60 to 70 degrees Fahrenheit before conditions are significantly safer, as chemical risks persist.
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Bloomberg broke the news in United States on Sunday, May 24, 2026.
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