According to the ministry, the government raised its travel alert for Iran to the highest level, which prohibits travel to the country, from the previous level that had advised South Korean nationals to leave.
The measure, which took effect from Thursday evening, came after last week's U.S.-led airstrikes against Iran amid growing concerns over the safety of South Koreans in the already volatile region.
The ministry warned that South Koreans visiting or staying in Tehran without prior authorization may face punishment, according to relevant laws.
"We advise South Koreans planning to travel to Iran to cancel their trips and those already there to leave immediately," the ministry said.
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