South Korea says it has launched an investigation into possible human rights violations following a U.S. immigration raid at a Hyundai factory in Georgia earlier this month.

Immigration and Customs Enforcement officers detained more than 300 South Korean workers during the raid on the battery plant. The workers returned home on Friday after being held for a week.

“We’ve expressed grave concerns to the U.S. government since this first happened,” a spokesperson for the South Korean presidential office said in a statement, according to . She added, “We plan to examine more closely whether there were issues related to our people’s rights or discomfort.”

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U.S. officials claimed the detained workers had a range of immigration issues. Some were allegedly in the U.S. illegally,

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