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A total of 475 workers, more than 300 of them South Koreans, in the Sept. 4 raid at the battery factory under construction at Hyundai’s sprawling auto plant. U.S. authorities released video showing some being shackled with chains around their hands, ankles and waists, causing shock and a sense of betrayal among many in South Korea, a key U.S. ally.

South Korea’s government later said it reached an agreement with the U.S. for the .

THIS IS A BREAKING NEWS UPDATE. AP’s earlier story follows below.

SEOUL, South Korea (AP) — A South Korean charter plane has arrived in Atlanta to take home detained in an immigration last week, but airport officials said the return flight with the workers on board planned for Wednesday had been canceled.

After a high-level meeting between U.S. and South Korean officials Wednesday morning, there was no immediate official word on when the workers would be able to leave, though South Korean media reported the charter plane was to leave Atlanta on Thursday. A spokesperson for Hartsfield-Jackson Atlanta International Airport said Wednesday afternoon that a planned flight had been canceled and had not been rescheduled.

A total of 475 workers, more than 300 of them South Koreans, in the Sept. 4 raid at the battery factory under construction at Hyundai’s sprawling auto plant. U.S. authorities released video showing some being shackled with chains around their hands, ankles and waists, causing shock and a sense of betrayal among many in South Korea, a key U.S. ally.

South Korea’s government later said it reached an agreement with the U.S. for the .

Korean workers expected to be brought back home after days of detention

South Korean TV footage showed the charter plane, a Boeing 747-8i from Korean Air, taking off at Incheon International Airport, just west of Seoul, and it landed in Atlanta on Wednesday morning.

South Korea's Foreign Ministry said the plane couldn't depart from the U.S. on Wednesday as South Korea earlier wished due to an unspecified reason involving the U.S. side.

During his visit to Washington on Wednesday, South Korean Foreign Minister Cho Hyun met U.S. Secretary of State Marco Rubio and told him that the South Korean public was left with “big pains and shocks� because the video of the workers' arrests was publicly disclosed, the ministry said in a statement.

Cho called for the U.S. administration to help the Korean workers leave as soon as possible — and without being handcuffed — and to make sure they don't face problems in future reentries to the U.S., the statement said.

The Korean workers were being held at an immigration detention center in Folkston in southeast Georgia. South Korean media reported they would be freed and driven 285 miles (460 kilometers) by bus to Atlanta to take the charter plane. Three empty buses were parked at the detention center.

It was not immediately clear Wednesday afternoon when the flight carrying the workers would depart for South Korea.

“As of now, it is canceled. We don’t have any further updates right now,� Atlanta airport spokesperson Jennifer Walters said in an email.

South Korean officials said they've been negotiating with the U.S. to win “voluntary� departures of the workers, rather than deportations that could result in making them ineligible to return to the U.S. for up to 10 years.

by the U.S. Homeland Security agency was its largest yet as it pursues its . The Georgia battery plant, a joint venture between Hyundai and LG Energy Solution, is one of more than 20 major industrial sites that South Korean companies are currently building in the United States.

Many South Koreans view the Georgia raid as a source of national disgrace and remain stunned over it. Only 10 days earlier, South Korean President and U.S. President Donald Trump held their in Washington on Aug. 25. In late July, South Korea also promised hundreds of billions of dollars in U.S. investments to reach a tariff deal.

Experts say South Korea won't likely take any major retaliatory steps against the U.S., but the Georgia raid could become a source of tensions between the allies as the Trump administration intensifies immigration raids.

South Korea calls for improvement in US visa systems

U.S. authorities said some of the detained workers had illegally crossed the U.S. border, while others had entered the country legally but had expired visas or entered on a visa waiver that prohibited them from working. But South Korean experts and officials said Washington has yet to act on Seoul’s yearslong demand to ensure a visa system to accommodate skilled Korean workers needed to build facilities, though it has been pressing South Korea to expand industrial investments in the U.S.

South Korean companies have been relying on short-term visitor visas or Electronic System for Travel Authorization to send workers needed to launch manufacturing sites and handle other setup tasks, a practice that had been largely tolerated for years.

LG Energy Solution, which employed most of the detained workers, instructed its South Korean employees in the U.S. on B-1 or B-2 short-term visit visas not to report to work until further notice, and told those with ESTAs to return home immediately.

During his meeting with Rubio, Cho, the South Korean foreign minister, proposed the creation of a joint South Korea-U.S. working group to introduce a new visa category for South Korean workers, according to Cho's ministry.

On Tuesday, Cho met representatives of major Korean companies operating in the U.S. including Hyundai, LG and Samsung on Tuesday. Cho told them that South Korean officials are in active discussions with U.S. officials and lawmakers about possible legislation to create a separate visa quota for South Korean professionals operating in the U.S., according to Cho's ministry.

and that the U.S. needs to work with other countries to have their experts train U.S. citizens to do specialized work such as battery and computer manufacturing.

Atlanta Charles Kuck, who represents several of the detained South Korean nationals, told The Associated Press on Monday that no company in the U.S. makes the machines used in the Georgia battery plant. So they had to come from abroad to install or repair equipment on-site — work that would take about three to five years to train someone in the U.S. to do, he said.

The South Korea-U.S. forged in blood during the 1950-53 Korean War, has experienced ups and downs over the decades. But surveys have shown a majority of South Koreans support the two countries’ alliance, as the U.S. deployment of 28,500 troops in South Korea and 50,000 others in Japan has served as the backbone of the American military presence in the Asia-Pacific region.

During a Cabinet Council meeting on Tuesday, Lee said he felt “big responsibility� over the raid and expressed hopes that the operations of South Korean businesses won’t be infringed upon unfairly again. He said his government will push to improve systems to prevent recurrences of similar incidents in close consultations with the U.S.

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Hyung-jin Kim and Kim Tong-hyung reported from Seoul, South Korea. Associated Press writer Kate Brumback contributed to this report from Atlanta.