US

AP —

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.

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.