The raid on Thursday has dealt a setback to the project, which is part of what would be the biggest investments in the state, and illustrates the increasing crackdown by the Trump administration on immigrants and its impact on businesses.

An agent at the US Department of Homeland Security (DHS) said multiple US agencies "conducted a judicially authorised enforcement operation, as we are actively conducting an investigation into unlawful employment practices."

"Arrests are being made," Steven Schrank, special agent in charge of Homeland Security Investigations for Georgia, said in a news briefing aired on US television.

A Korean news report said about 30 South Korean nationals had been detained.

The Atlanta office of the US Justice Department agency ATF reported the raid in a post on X.

The battery production facility, a joint venture between South Korean battery maker LG Energy Solution (LGES) and Hyundai Motor, was due to start operations at the end of this year, according to LGES.

A spokesperson at the Hyundai-GA battery company said in a statement that it was "cooperating fully with the appropriate authorities regarding activity at our construction site" and that it had paused construction work to assist.

Hyundai Motor said its production of electric vehicles at the sprawling site was not affected.

“We are closely cooperating with the South Korean government and relevant authorities to ensure the safety of our employees and staff at contractors, and to secure their swift release from detention," LG Energy Solution said in a statement, adding it is providing "all necessary support, including interpreters and legal assistance."

LGES shares dropped 2.3 percent.

BIGGEST INVESTMENTS IN GEORGIA

In 2023, Hyundai Motor Group and LG Energy Solution announced the US$4.3 billion venture to produce EV battery cells, with each company holding a 50 percent stake. The plant will supply batteries for Hyundai, Kia and Genesis EV models.

The battery factory is part of Hyundai's $12.6 billion investments in the state, including the automaker's just-opened car factory, in what would be "the largest economic development project in the state’s history."

A social media video footage showed a man wearing a vest with the letters HSI, an acronym for Homeland Security Investigations, telling workers in yellow safety vests: "We have a search warrant for the whole site. We need construction to cease immediately. We need all work to end on the site right now."

Under US President Donald Trump, the Immigration and Customs Enforcement agency, which is part of the Department of Homeland Security, has become the driving force of the Republican leader's sweeping crackdown on migrants, bolstered by record funding and new latitude to conduct raids.

Trump has said he wants to deport "the worst of the worst" criminals but ICE figures have shown a rise in non-criminals being picked up. Rights advocates have denounced such raids.

The US is adding pressure on Korea Inc, one of the major investors in the United States, at a time when Washington and South Korea are at odds over details of a trade deal, which includes $350 billion of investments.