South Korea Says Shots Fired From North Korea, Fires Back

Seoul, South Korea (CNN) -- South Korea fired back at North Korea on Wednesday after it said three shots from the North hit waters close to the maritime border.

There were no casualties reported, the South Korean defense ministry said.Tensions between the neighbors heightened last year after 50 South Koreans were killed in two separate incidents.In November, the South accused North Korea of shelling Yeonpyeong Island, near the border between the two sides.

The incident killed two South Korean marines and two civilians.

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