PAJU, SOUTH KOREA - DECEMBER 15: South Koreans participate in a civil defense exercise on December 15, 2010 in Paju, South Korea. The nationwide exercises are intended to better prepare citizens for ... more 
PAJU, SOUTH KOREA - DECEMBER 15: South Koreans participate in a civil defense exercise on December 15, 2010 in Paju, South Korea. The nationwide exercises are intended to better prepare citizens for emergencies as tensions continue to rise following an artillery exchange between the two nations last month. The 20 minute exercise kicked off with air raid sirens with pedestrians required to head to designated bomb shelters and drivers required to stop their vehicles for 15 minutes. (Photo by Chung Sung-Jun/Getty Images) less 
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Getty Images | Photo By Chung Sung-Jun / Getty Images
Fri, Dec 17, 2010 5:33 AM EST