The Joint Chiefs of Staff on Tuesday urged the public to exercise caution in border areas during periods of heavy rainfall, warning that land mines buried near the Demilitarized Zone could be washed away and carried into civilian areas through rivers. According to the Joint Chiefs of Staff, North Korean land mines in the DMZ could be washed down south during the rainy season in areas connected to rivers shared by South and North Korea, including the Imjin River, Hantan River, Hwagang River, Bukh