INCHEON, South Korea — Rescuers found the burned bodies Wednesday of two islanders killed in a North Korean artillery attack — the first civilian deaths from a skirmish that marked a dramatic escalation of tensions between the rival Koreas.
The barrage on the tiny island of Yeonpyeong in the western waters near the Koreas' maritime border also killed two South Korean marines and wounded 18 others Tuesday in what U.N. Secretary-General Ban Ki-moon called one of the "gravest incidents" since the Korean War.
As South Korean troops remained on high alert and buildings continued to burn, exhausted evacuees streamed into the port city of Incheon after spending the night in underground shelters, embracing tearful family members and telling harrowing tales of destruction.
President Barack Obama underlined Washington's pledge to "stand shoulder to shoulder" with Seoul and called upon China to restrain ally North Korea.
The U.S. stations more than 28,000 troops in South Korea to guard against North Korean aggression, a legacy of the bitter three-year conflict that ended in a truce, not a peace treaty, in 1953. Seoul and Washington reaffirmed plans to stage joint military exercises later this week in the Yellow Sea, just 70 miles (110 kilometers) south of Yeonpyeong island. The White House said the USS George Washington aircraft carrier would head to Korean waters to take part.
In Pyongyang, residents boasted that the exchange showed off their military's strength and ability to counter South Korean aggression.
"I think this time our military demonstrated to the whole world that it doesn't make empty talk," Ri Pong Suk told TV news agency APTN in the North Korean capital.
China — North Korea's closet ally and its largest supplier of aid — said late Wednesday it was "highly concerned" about the exchange and urged restraint.
China "feels pain and regret about an incident causing deaths and property losses and is worried about the developments," Foreign Ministry spokesman Hong Lei said in a statement. "We have always maintained that the relevant parties should, through dialogue and consultation, resolve disputes by peaceful means."
Artillery and gunfire break out sporadically along the land and maritime borders dividing the two Koreas, and have erupted in deadly exchanges four times since 1999.
And in March, North Korea was accused of launching a torpedo that sank a South Korean warship, the Cheonan, killing 46 sailors. Seoul considers it the worst military attack on the country since the war, but Pyongyang has denied responsibility.
The North's most notorious act of terrorism was the 1987 bombing of a South Korean airliner that claimed 115 lives. And in 1996, a group of North Korean spies slipped ashore from a submarine and killed three civilians and a South Korean army private while roaming the countryside for weeks.
However, Tuesday's shower of artillery was the first to strike a civilian population. The bodies of two men, believed in their 60s, were pulled out from a destroyed construction site Wednesday, the coast guard said.
South Koreans see the killing of civilians as taking the confrontation to a new level, one analyst said.
"It's clearly a line for people, and crossing that line puts it in a different category," said John Delury, an assistant professor at Seoul's Yonsei University Graduate School of International Studies. "People here are feeling very conflicted, outrage and sorrow."
Yeonpyeong island, famous for its crabs, still looked like a war zone Wednesday, with burned-out buildings still smoldering, windows smashed and shattered, and huge craters from shells pockmarking homes, footage aired by YTN television showed.
One of the main targets was a supermarket that once housed the office of a military intelligence agency, local official Choi Chul-young told The Associated Press by telephone from the island.
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