The Hyundai Motor Group Metaplant America is seen March 26 in Ellabell, Ga. (Mike Stewart | AP)SEOUL, South Korea — South Korea on Friday expressed “concern and regret” over a major U.S. immigration raid at a sprawling Georgia site where South Korean auto company Hyundai manufactures electric vehicles. South Korean Foreign Ministry spokesperson Lee Jaewoong described the number of detained South Koreans as “large” though he did not provide an exact figure. His ministry would not confirm or deny South Korean media reports saying that about 300 South Koreans were detained in Georgia on Thursday. Hyundai’s South Korean office didn’t immediately respond to requests for comment. He said agents were focused on the construction site for the battery plant.