Hundreds of federal agents descended on a sprawling site where Hyundai manufactures electric vehicles in Georgia and detained 475 people, most of them South Korean nationals.

This is the latest in a long line of workplace raids conducted as part of the Trump administration's mass deportation agenda. But the one on Thursday is especially distinct because of its large size and the fact that it targeted a manufacturing site state officials have long called Georgia's largest economic development project.

The detainment of South Korean nationals also sets it apart, as they are rarely caught up in immigration enforcement compared to other nationalities.

Here are some things to know about the raid and the people impacted:

Most of the hundreds of people detained were South Korean nationals, although the exact number was not immediately released.

Some of them worked for the battery plant operated by HL-GA Battery Co., a joint venture by Hyundai and LG Energy Solution that is slated to open next year, while others were employed by contractors and subcontractors at the construction site, according to Steven Schrank, the lead Georgia agent of Homeland Security Investigations.

He said that some of the detained workers had illegally crossed the U.S. border, while others had entered the country legally but had expired visas or had entered on a visa waiver that prohibited them from working.

But an immigration attorney representing two of the detained workers said his clients arrived from South Korea under a visa waiver program that enables them to travel for tourism or business for stays of 90 days or less without obtaining a visa.

Attorney Charles Kuck said one of his clients has been in the U.S. for a couple of weeks, while the other has been in the country for about 45 days, adding that they had been planning to return home soon.

Hyundai Motor Company said in a statement Friday that none of its employees had been detained as far as it knew and that it is reviewing its practices to make sure suppliers and subcontractors follow U.S. employment laws. LG told The Associated Press that it couldn't immediately confirm how many of its employees or Hyundai workers had been detained.

The South Korean government expressed "concern and regret" over the operation targeting its citizens and is sending diplomats to the site.

"The business activities of our investors and the rights of our nationals must not be unjustly infringed in the process of U.S. law enforcement," South Korean Foreign Ministry spokesperson Lee Jaewoong said in a televised statement from Seoul.

Most of the people detained have been taken to an immigration detention center in Folkston, Georgia, near the Florida state line. None of them have been charged with any crimes yet, Schrank said, but the investigation is ongoing.

The raid was the result of a monthslong investigation into allegations of illegal hiring at the site, Schrank said.

In a search warrant and related affidavits, agents sought everything from employment records for current and former workers and timecards to video and photos of workers.

Court records filed this week indicated that prosecutors do not know who hired what it called "hundreds of illegal aliens." The identity of the "actual company or contractor hiring the illegal aliens is currently unknown," the U.S. Attorney's Office wrote in a Thursday court filing.

The raid targeted a manufacturing site widely considered one of Georgia's largest and most high profile.

Hyundai Motor Group started manufacturing EVs at the $7.6 billion plant a year ago. Today, the site employs about 1,200 people in a largely rural area about 25 miles (40 kilometers) west of Savannah.

Agents specifically honed in on an adjacent plant that is still under construction at which Hyundai has partnered with LG Energy Solution to produce batteries that power EVs.

The Hyundai site is in Bryan County, which saw its population increase by more than a quarter in the early 2020s and stood at almost 47,000 residents in 2023, the most recent year data is available. The county's Asian population went from 1.5% in 2018 to 2.2% in 2023, and the growth was primarily among people of Indian descent, according to Census Bureau figures.

From farms and construction sites to restaurants and auto repair shops, there have been a wide array of workplace raids undertaken in this administration. But most have been smaller, including a raid the same day as the Georgia one in which federal officers took away dozens of workers from a snack-bar manufacturer in Cato, New York.

Other recent high-profile raids have included one in July targeting a legal marijuana farm northwest of Los Angeles. More than 360 people were arrested in one of the largest raids since Trump took office in January. Another one took place at an Omaha. Nebraska, meat production plant and involved dozens of workers being taken away.

Schrank described the one in Georgia as the "largest single site enforcement operation" in the agency's two-decade history.

The majority of the people detained are Koreans. During the 12-month period that ended Sept. 30, 2024, only 46 Koreans were deported during out of more than 270,000 removals for all nationalities, according to Immigration and Customs Enforcement.

Kemp and other Georgia Republican officials, who had courted Hyundai and celebrated the EV plant's opening, issued statements Friday saying all employers in the state were expected to follow the law.

The nonprofit legal advocacy organization Asian Americans Advancing Justice-Atlanta described the raid in a joint statement as "unacceptable."

"Our communities know the workers targeted at Hyundai are everyday people who are trying to feed their families, build stronger communities, and work toward a better future," the statement said.

Sammie Rentz opened the Viet Huong Supermarket less than 3 miles (4.8 kilometers) from the Hyundai site six months ago and said he worries business may not bounce back after falling off sharply since the raid.

"I'm concerned. Koreans are very proud people, and I bet they're not appreciating what just happened. I'm worried about them cutting and running, or starting an exit strategy," he said.

Ellabell resident Tanya Cox, who lives less than a mile from the Hyundai site, said she had no ill feelings toward Korean nationals or other immigrant workers at the site. But few neighbors were employed there, and she felt like more construction jobs at the battery plant should have gone to local residents.

"I don't see how it's brought a lot of jobs to our community or nearby communities," Cox said.