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Smoke rises from South Korea's Yeonpyeong island Tuesday as North Korea fired artillery barrages onto the South Korean island near their disputed border. Image Credit: AP

Incheon: South Korea says it has found the burnt bodies of two islanders killed in a North Korean artillery attack, marking the first two civilian deaths in the crisis and escalating tensions between the rival Koreas.

The South Korean Coast Guard found the bodies of two men on a destroyed construction site on the island. They're believed to be in their sixties.

The discovery comes a day after a frightening military skirmish between the Koreas ratcheted tensions on the peninsula to new extremes.

North Korea's artillery attack on a small South Korean island near their disputed border also killed at least two marines and wounded 18 other people in what UN Secretary-General Ban Ki-moon called one of the "gravest incidents" since the end of the Korean War.