South Korea’s foreign minister departed for the U.S. on Monday following the mass immigration raid by U.S. government officials on the Hyundai-LG battery factory in Georgia last week when some 300 South Koreans were detained.

While speaking with reporters ahead of his trip to the U.S., South Korean Foreign Minister Cho Hyun called it "a grave situation" and said he was in communication with Washington after U.S. immigration authorities on Friday arrested 475 individuals from the plant near Savannah in what federal officials called the "largest-ever" workplace raid.

Details of the immigration-related violations remain unclear, but on Monday South Korean officials suggested workers may have surpassed their 90-day visa waivers, violating the terms of their temporary visa.

According t

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