South Korea said Tuesday that it returned fire after North Korea fired artillery onto a South Korean island and into the sea near the countries' disputed western border.
A South Korean Joint Chiefs of Staff official said dozens of rounds of artillery landed on Yeonpyeong island. The official says South Korea fired back. The official, who spoke on condition of anonymity because of JCS rules, had no other details.
The firing comes amid tension over North Korea's claim that it has a new uranium enrichment facility.
The countries' western maritime boundary has long been a flash point between the two Koreas. The North does not recognize the border that was unilaterally drawn by the United Nations at the close of the 1950-53 Korean War.
North and South Korea have fought three bloody skirmishes near the maritime border in recent years, most recently in November 2009.