South Korean coast guard help people to disembark from a ship at a port in Incheon, South Korea after they were evacuated from Yeonpyeong Island,  Wednesday, Nov. 24, 2010. South Korea's troops were on high alert Wednesday as their government exchanged threats with rival North Korea following a frightening military skirmish that ratcheted tensions on the peninsula to new extremes. (AP Photo/David Guttenfelder)

Photo by: David Guttenfelder

South Korean coast guard help people to disembark from a ship at a port in Incheon, South Korea after they were evacuated from Yeonpyeong Island, Wednesday, Nov. 24, 2010. South Korea's troops were on high alert Wednesday as their government exchanged threats with rival North Korea following a frightening military skirmish that ratcheted tensions on the peninsula to new extremes. (AP Photo/David Guttenfelder)