Federal law enforcement officials said they conducted a raid at a Georgia battery plant they called the "largest single-site enforcement operation in the history of Homeland Security Investigations."

The operation took place at a Hyundai plant in Bryan County, Georgia. Officials said that 475 people — mostly South Korean nationals — were apprehended. Some of those present had entered the U.S. illegally, overstayed their visas, or did not have proper work permits.

As of Friday morning, no criminal charges had been filed against the 475 detainees, special agent in charge of Homeland Security Investigations Steve Schrank said.

"This was not an immigration operation where agents went into the premises, rounded up, and took them on buses," he said. "This has been a multi-month criminal inves

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