Two North Korean vessels crossed the de facto western maritime border Friday amid heightened tensions in inter-Korean relations, Seoul's military said.
The Navy fired warning shots at the North Korean vessels -- a fishing boat and a patrol boat -- as they trespassed across the maritime border in the Yellow Sea, widely known as the Northern Limit Line, at around 7:30 a.m, according to the Joint Chiefs of Staff.
They returned to the northern side immediately after the warning shots were fired, it added. (Yonhap)