SEOUL (AFP) - The helicopter, identified by the Yonhap news agency as a UH-60 Black Hawk, came down in Cheolwon county, which touches on the border with North Korea, a defence ministry spokesman told AFP.
The precise cause of the crash was not immediately clear, but the incident occurred during ongoing South Korea-US joint military exercises.
Yonhap quoted emergency rescue workers as saying the 12 service personnel on board the helicopter had survived the crash, which comes at a time of heightened military tensions on the Korean peninsula.
Michelle Broder Van Dyke is a reporter and night editor for BuzzFeed News and is based in Hawaii.
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