Foreign Minister Cho Hyun says he is ‘deeply concerned’ over detention of 300 South Koreans, while opposition calls it a ‘grave matter’.

South Korean President Lee Jae-myung has ordered all-out efforts to respond to the arrests of hundreds of the country’s citizens in an immigration raid on a Hyundai Motor-LG car battery factory in the United States.

Thursday’s arrest of some 475 workers – more than 300 of them South Korean nationals – at the plant near Savannah in the southern US state of Georgia was the largest single-site enforcement operation carried out by the Immigration and Customs Enforcement (ICE), an arm of the US Department of Homeland Security.