South Korea has lodged a strong protest with Washington after US immigration agents detained hundreds of its citizens in a raid on a Hyundai battery plant in Georgia. More than 300 workers have since returned home, according to BBC.

Seoul is investigating possible human rights violations and urged US authorities to respect its nationals’ rights. President Lee Jae-myung warned the incident could undermine investment, calling it “bewildering.”

The September 4 operation, the largest single-site immigration raid under President Donald Trump, led to 475 arrests. US officials said many lacked valid visas or work permits. Trump later stressed foreign workers remain welcome and vital to US industries, BBC reported.