Footage of raid by US immigration officials showed detained workers in handcuffs and with chains around their ankles

South Korea has said negotiations with the US to secure the release of its nationals detained in a raid by US immigration officials on a Hyundai plant in the state of Georgia have been “concluded” and that they would soon be freed and flown home.

It follows the arrest of more than 300 South Korean workers at a Hyundai-LG battery site being built in the southern US on Thursday.

Footage of the raid released by US authorities showed detained workers, in handcuffs and with chains around their ankles, being loaded on to an inmate transportation bus.

The operation, carried out in the town of Ellabell, was the largest single site raid implemented so far under President Donald Trump’s nationwide anti-migrant drive, catching Seoul officials off guard.