North, South Korea Exchange Fire

    South Korean sailors work on their ships next to South Korean Navy's floating base near Yeonpyeong Island, South Korea, Wednesday, Dec. 22, 2010. South Korea vowed Wednesday to "punish the enemy" if the North attacks it again as hundreds of southern troops, fighter jets, tanks and attack helicopters prepared for massive military exercises scheduled because of the high tensions. (AP Photo/Ahn Young-joon)

    Ahn Young-joon / AP Photo

    South Korea military officers fired at North Korea Wednesday, after marines on the island of Yeonpyeong spotted three artillery shells in nearby water. The shots were fired near the Northern Limit Line, which South Korea patrols and was drawn by the United Nations. North Korea, however, has long said that the line should be further south. The exchange increases tension between the two nations, after a North Korea attack killed four on the island in November.

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