North and South Korea exchanged artillery fire along their disputed western sea border today, two days after the North designated no-sail zones in the area, the military and news reports said. North Korea fired several rounds of land-based artillery off its coast, an officer at the Joint Chiefs of Staff in Seoul said. The officer, who spoke on condition of anonymity, said no casualities or damage were immediately reported. South Korea, in response, immediately fired warning shots from a marine base on an island near the sea border, according to Seoul's Yonhap news agency.

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