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In Seoul, a senior South Korean government official said the military would remain prepared for the possibility of a “surprise” attack in coming days. He spoke on condition of anonymity because of the sensitivity of the matter.

Separately, about 200 South Koreans attended a candlelight vigil Wednesday evening for the four South Koreans killed by North Korea’s attack on Yeonpyeong. They observed a moment of silence and placed flowers on a makeshift mourning site in central Seoul.

“We, the survivors, should remember their sacrifice and make efforts to ensure that their sacrifice will not be in vain,” said Choi Hong-jae, a 42-year-old executive.

Associated Press writers Jean H. Lee, Foster Klug and Kim Kwang-tae in Seoul; Lee Jin-man in Gimpo, South Korea; and Mark S. Smith in Washington contributed to this report.