North Korea threatened retaliation on Friday after South Korea fired what it said were warning shots when a patrol boat and fishing boat from the North crossed the disputed sea border off the west coast of the Korean peninsula.
The two vessels from the North retreated about eight minutes after the South Korean navy fired five 40 mm artillery shots at around 7:30 a.m. local time, South Korean officials told Reuters.
The North Korean boats had crossed the Northern Limit Line, a border that the North disputes, near the South Korean border island of Yeonpyeong, according to the South Korean military.
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