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(NewsNation) — Federal agents have detained roughly 475 workers from a Hyundai plant in Ellabell, Georgia, in what officials are calling the “largest single site operation" in Homeland Security Investigations history.
The Thursday night raid at the HL-GA battery plant — part of a megasite by the South Korean auto company — was months in the making, said Steven Schrank, HSI special agent in charge.
Schrank on Friday said the detainees were "illegally present in the United States, or in violation of their presence in the United States, working unlawfully."
A majority of workers were South Korean nationals, per Schrank.
South Korean Foreign Ministry spokesperson Lee Jaewoong described the number of detained South Koreans as “large" and part of a "network of subcontractors," The Associated Press reported.
No criminal charges have been announced yet, but Schrank said the investigation is "an ongoing matter."