Federal authorities served a search warrant on Wednesday at a Southern California aerospace facility where a chemical tank overheated last month, forcing 50,000 residents to evacuate.
Evacuees Rodger Macias, right, and his wife Alendera Marcias set up a tent outside the Elks Lodge in Garden Grove, Calif. , on Monday, May 25, 2026.
Water is sprayed on a damaged tank at GKN Aerospace in Garden Grove, Calif. , on Sunday, May 24, 2026, after the tank containing a chemical used to make plastic parts overheated Thursday. Evacuees Rodger Macias, left, his wife Alendera Marcias, and son, Adam Marcias, set up a tent outside the Elks Lodge in Garden Grove, Calif. , on Monday, May 25, 2026.
Jan De Jonge kisses a pet while sitting inside a tent with their belonging outside the Elks Lodge in Garden Grove, Calif. , on Monday, May 25, 2026. An American Red Cross volunteer walks outside Freedom Hall, an evacuation center in Fountain Valley, Calif. ,on Monday, May 25, 2026.
Evacuees Rodger Macias, right, and his wife Alendera Marcias set up a tent outside the Elks Lodge in Garden Grove, Calif. , on Monday, May 25, 2026. The warrant signed by a federal judge last week approved the seizure of documents and records related to the “storage, use, or disposal” of methyl methacrylate, the chemical inside the affected tank.
“Samples of the substance within any tank, tote, drum, vat, vessel, or container suspected of containing or having previously contained methyl methacrylate and/or any hazardous substance” were also sought, according to the warrant. The warrant also orders agents to seize records related to “any cooling equipment or other equipment used to control or regulate the temperature of methyl methacrylate. ” The FBI confirmed its agents were searching GKN Aerospace Transparency Systems in the Orange County city of Garden Grove.
GKN Aerospace makes cockpit windows, canopies and windshields. The tank that overheated contained 6,000 to 7,000 gallons of methyl methacrylate, which is highly flammable Exposure to the chemical can cause serious respiratory problems, neurological issues and irritation to the skin, eyes and throat, according toSeparately, the Orange County District Attorney’s Office also is conducting a criminal investigation into the GKN Aerospace plant, according to spokesperson Kimberly Edds.
“We have sent a preservation letter to GKN directing them not to modify or destroy any evidence, which the company’s outside counsel confirmed receipt,” Edds told The Associated Press in an email. About a dozen people and businesses that were among the 50,000 evacuated during the chemical emergency have filed federal lawsuits against the company. Copyright 2026 The Associated Press. All rights reserved.
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