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The South Korean government said it is working to return its nationals who were detained in an immigration raid on a Hyundai

facility in Georgia last week.

Federal and immigration agents conducted a massive sweep on the plant in Ellabell, Georgia, arresting 475 people as part of an investigation into allegations of unlawful employment practices. A South Korean spokesperson told NBC News that more than 300 of the arrests were South Korean nationals.

U.S. authorities, who had a search warrant, said the arrested workers were working or living in the country illegally.