They say three artillery shells landed off the South's Yeonpyeong island in the Yellow Sea.
It is not clear on which side of the border they fell.
Last November the North fired shells at Yeonpyeong, killing four, in one of the worst clashes since the Korean War.
Pyongyang said at the time that it had been provoked by military exercises being held by the South close to the island.
The incident triggered outrage in South Korea, which
increased troop numbers on Yeonpyeong and said it would respond more
forcefully in the future.
The crisis came months after the sinking of a South Korean warship, the Cheonan, widely blamed on North Korea.
The two countries technically remain at war following the 1950-53 Korean War.
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