Members of the National Emergency Management Agency check their gas masks as they inspect emergency evacuation facilities at a subway station in Seoul, South Korea, Sunday, Nov. 28, 2010. South Korea, Sunday, Nov. 28, 2010. The rattle of new artillery fire from North Korea just hours after the U.S. and South Korea launched a round of war games in Korean waters sent residents, journalists, police and troops on a front-line island scrambling for cover Sunday. (AP Photo/Yonhap, Kim Ju-sung ) KOREA OUT

Associated Press
Members of the National Emergency Management Agency check their gas masks as they inspect emergency evacuation facilities at a subway station in Seoul, South Korea, Sunday, Nov. 28, 2010. South Korea, Sunday, Nov. 28, 2010. The rattle of new artillery fire from North Korea just hours after the U.S. and South Korea launched a round of war games in Korean waters sent residents, journalists, police and troops on a front-line island scrambling for cover Sunday. (AP Photo/Yonhap, Kim Ju-sung )  KOREA OUT
Members of the National Emergency Management Agency check their gas masks as they inspect emergency evacuation facilities at a subway station in Seoul, South Korea, Sunday, Nov. 28, 2010. South Korea, Sunday, Nov. 28, 2010. The rattle of new artillery fire from North Korea just hours after the U.S. and South Korea launched a round of war games in Korean waters sent residents, journalists, police and troops on a front-line island scrambling for cover Sunday.
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