FBI searches Southern California aerospace plant after chemical tank overheated

Federal agents searched GKN Aerospace Transparency Systems in Garden Grove, California, on Wednesday as the investigation into a May chemical emergency at the plant widened.

The search adds federal criminal scrutiny to an incident that already prompted evacuations, lawsuits and questions from local officials about how the company stored and controlled a tank of methyl methacrylate.

FBI search at the plant

The FBI executed a search warrant at the aerospace facility, according to published reports. The warrant authorized agents to seize records and samples related to the storage, use and disposal of methyl methacrylate, along with temperature-control equipment tied to the tank.

GKN Aerospace said it is cooperating with authorities. The company also apologized to the community at a public meeting, but said it was too early to decide whether the tanks would be relocated.

What happened in May

The search is tied to a May 21 incident in which a methyl methacrylate tank overheated at the Garden Grove plant. AP reported that roughly 50,000 residents were evacuated during the emergency.

Earlier reporting said a crack in the tank relieved pressure and helped avert a potentially catastrophic explosion. The chemical involved is highly flammable and used in plastics and coatings manufacturing.

Parallel investigations and public pressure

The Orange County district attorney's office is running a separate criminal investigation into the incident. The FBI search adds another layer of pressure as investigators review what happened at the site and whether the overheating was preventable.

Local officials have also pressed the company for answers about chemical storage and future site safety. The plant sits in a residential area of Garden Grove, making the emergency especially disruptive for nearby residents and businesses.

Lawsuits and what comes next

Several residents and businesses have filed lawsuits over the incident. Cleanup and air-monitoring efforts are expected to continue while the company weighs changes to chemical storage.

The main open questions are whether prosecutors will seek charges, whether investigators will request more warrants, and whether GKN will ultimately move the methyl methacrylate tanks or redesign the site.