South Korean president Lee Myung-bak says Seoul will unleash an "enormous retaliation" should North Korea attack again.
Myung-bak said Tuesday that the North's "indiscriminate attack on civilians can never be tolerated."
His comments were posted on the presidential website and made during a visit to the Joint Chiefs of Staff's command and control room.
His comments came as North and South Korea exchanged artillery fire Tuesday after the North shelled an island near their disputed sea border. Two South Korean marines were killed.
U.N. Secretary-General Ban Ki-moon is condemning North Korea's artillery attack by South Korea's Yeongpyeong Island and is conveying his concerns to the Security Council's president.
Ban said Tuesday that the attack was "one of the gravest incidents since the end of the Korean War."
British Ambassador Mark Lyall Grant, whose country holds the council presidency, says there has not been a formal request for a meeting on the matter.
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