More than 300 South Koreans were among 475 people arrested by US immigration officials in a raid on a Hyundai-LG battery plant being built in the southern US state of Georgia, the foreign minister in Seoul said on Saturday.

Steven Schrank, a Homeland Security Investigations special agent in Atlanta, earlier said Thursday's operation was the largest single site raid carried out so far under US President Donald Trump's nationwide anti-migrant drive.

The raid stemmed from a "criminal investigation into allegations of unlawful employment practices and serious federal crimes" at the Hyundai Motor-LG Energy Solution joint venture plant in the town of Ellabell, Schrank told reporters on Friday.

"This was not an immigration operation where agents went into the premises, rounded up folks and put

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