(CNN) South Korean Prime Minister Hwang Kyo-ahn was stranded inside his car for hours on Friday, surrounded by an angry mob opposing the deployment of an advanced missile defense system in Seongju county in the country's south.

The South Korean military announced on Wednesday that it will place the Terminal High Altitude Area Defense (THAAD) in the county, which is about 250 kilometers southeast of the capital Seoul. It said the placement could ensure the safety of country's population from North Korea's nuclear and missile threats.

But many of the county's 45,000 residents - mostly farmers - strongly oppose the decision, citing health and environmental concerns. They said officials never consulted them before announcing the decision.

PM visit not enough to allay anger

Prime Minister Hwang visited Seongju county on Friday in an attempt to ease their anger.

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