FBI seizing evidence at California plant where chemical tank overheated

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 because authorities feared an explosion. National FBI seizing evidence at California plant where chemical tank overheated June 10, 20267:05 PM ET By  The Associated Press Ariel view of the chemical tank at GKN Aerospace in Garden Grove, Calif., on Wednesday. William Liang/AP hide caption toggle caption William Liang/AP LOS ANGELES — 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 because authorities feared a catastrophic explosion. 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. National California chemical tank has cracked, causing state of emergency, thousands to evacuate "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. Multiple vehicles and several federal agents were seen outside the facility Wednesday morning. Company says it's cooperating with authorities GKN Aerospace makes cockpit windows, canopies and windshields. The tank that overheated contained 6,000 to 7,000 gallons (22,700 to 26,500 liters) of methyl methacrylate, which is highly flammable. The liquid is used in the manufacturing of plastics and coatings, such as Plexiglas and dental prosthetics. Exposure to the chemical can cause serious respiratory problems, neurological issues and irritation to the skin, eyes and throat, according to the Environmental Protection Agency. The chemical that overheated is still in the holding tank, according to the Orange County Health Care Agency, which is leading the site cleanup and waste removal efforts. The agency had planned to pump the neutralized methyl methacrylate from the storage tanks into sealed trucks for transport and disposal starting at the end of last week, according to a press release on the agency's website. But on Friday, they said the removal didn't happen "due to unavailable resources." Once a new date is confirmed, they will provide advance notice to the community.