Departing Korean Airlines planes pass each other at Hartsfield-Jackson Atlanta International Airport in Atlanta, Ga., on Wednesday. A Korean Air charter plane is expected to repatriate about 300 South Korean workers who were among 475 arrested during a U.S. Immigration and Customs Enforcement raid at a construction site for an electric vehicle battery plant being built by Hyundai Motor Group-LG Energy in Ellabell, Ga. South Korean officials continue to negotiate the repatriation charter flight for the detainees. Photo by Erik S. Lesser/EPA

Sept. 10 (UPI) -- The exit of 300 Korean workers detained in Georgia has been delayed due to "a cause from the U.S. side," according to the South Korean Ministry of Foreign Affairs.

The detainees were scheduled to board a Korean Air charter plane from Atlanta's Hartsfield-Jackson International Airport to head home Wednesday afternoon. The ministry hasn't said what is causing the delay, The Korea Times reported.

"The government is continuing consultation with the U.S. for as swift a departure as possible. We will provide further updates once a new schedule is confirmed," it said.

Homeland Security Investigations, Immigration and Customs Enforcement and other law enforcement conducted the raid on Thursday and said those who were detained are not authorized to work in the United States.