North and South Korean officials have struck a deal after negotiations to end tensions on the peninsula.
The dispute, over South Korea's anti-North propaganda broadcasts, had brought the two sides to the brink of armed conflict.
North Korea opened fire at its neighbours to the south today, targeting a loud speaker which has been broadcasting anti-Pyongyang material in recent days, according to local media.
State-run KBS News said the North Korean military opened fire on the western front at around 4pm (8am BST).
The Yonyap news agency in South Korea said there was no apparent damage caused by the shots.
Dozens of rounds of artillery was fired back towards North Korea in retaliation, the agency added, citing military sources - but no immediate response was apparent.
In 2004, North and South Korea agreed to stop blaring propaganda at one another across the border, but such broadcasts have resumed in recent days as relations between the two countries deteriorate.
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