Immigration authorities arrested hundreds of workers for a major South Korean battery maker at a Hyundai plant in Georgia, U.S. officials said Friday, calling it the largest ever Homeland Security enforcement operation at a single location.
Agents on Thursday arrested 475 people, most of whom are South Korean citizens, at a construction site for an electric vehicle battery plant in Ellabell, Ga., near Savannah, Steven Schrank, a special agent in charge of Homeland Security investigations for Georgia, said at a news conference.
He said that the workers arrested were in the United States illegally or were working unlawfully. No criminal charges would be announced on Friday, he said, adding that investigators were still determining employment details for those arrested, some of whom worked for subcontractors.
“This operation underscores our commitment to protecting jobs for Georgians and Americans, ensuring a level playing field for businesses that comply with the law, safeguarding the integrity of our economy and protecting workers from exploitation,” Mr. Schrank said.
Most of those arrested were held at the Folkston detention facility on Thursday night and would be moved based on their individual circumstances, he said. One person arrested was treated at the scene for overheating, and one agent suffered a “minor laceration,” but there were no major injuries, he added.
The battery manufacturer, LG Energy Solution, which co-owns the plant with Hyundai Motor Group, said in a statement that employees of both companies, including executives, had been taken into custody.
Hyundai said that none of those detained were Hyundai employees, as far as the company was aware.
“We are closely monitoring the situation and working to understand the specific circumstances,” Hyundai said on Friday.
South Korea’s Foreign Ministry confirmed on Friday that South Koreans were among those in custody, without saying how many. Mr. Schrank told reporters at the plant on Thursday that some U.S. citizens and lawful permanent residents had been detained initially and were being released.
The agencies involved in the operation included the Department of Homeland Security, Immigration and Customs Enforcement and the F.B.I., according to the Atlanta division of the Bureau of Alcohol, Tobacco, Firearms and Explosives, which also participated.
The operation, part of President Trump’s crackdown on immigration, caused diplomatic alarm in South Korea. Just over a week earlier, Mr. Trump hosted President Lee Jae Myung of South Korea at the White House, where the South Korean leader pledged to invest an additional $150 billion in the United States, including in battery manufacturing.
The lithium-ion battery plant, which predated Mr. Lee’s pledge, was expected to start operating next year. It is the kind of large-scale, job-creating investment that the United States has pushed for from South Korea and other nations.
The Ellabell site is part of one of Georgia’s largest manufacturing plants. Gov. Brian Kemp of Georgia, a Republican, has promoted the $7.6 billion Hyundai E.V. factory there as the largest economic development project in state history.
The immigration operation brought construction to a halt at the battery plant, known as HL-GA Battery Company. A spokeswoman, Mary Beth Kennedy, said in a statement that the plant was cooperating with the authorities.
South Korean Embassy and consular officials were sent to the site from Washington and Atlanta, Lee Jaewoong, a spokesman for South Korea’s Foreign Ministry, said at a news conference earlier on Friday. He expressed concern that South Koreans had been detained.
“The economic activities of our investment companies and the rights and interests of our citizens must not be unjustly violated during U.S. law enforcement proceedings,” he said.
LG Energy Solution said that it was working with the South Korean government to get its employees, as well as Hyundai’s, released.
Neal E. Boudette contributed reporting from Detroit.
John Yoon is a Times reporter based in Seoul who covers breaking and trending news.
Jenny Gross is a reporter for The Times covering breaking news and other topics.
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