South Korea says it's heard off Yeongpyeong Island fresh artillery shots fired from within North Korea.
Seoul says none of the shells landed in its territory and it believes that its neighbour was carrying out a military exercise.
The government have already shored up defences on Yeonpyeong island, near the border, and evacuated all but thirty residents.
Meanwhile, North Korea warns that a planned military exercise between the US and South Korea could push the region towards war.
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