South Korea Fires, North Korea Responds With Silence (Video)
K-9 howitzers, 81-mm mortars, and 105-mm and Vulcan Gatling artillery guns exploded through the Korean sky.

South Korean soldiers take shelter in a bunker during a live-fire exercise on Yeonpyeong island near the disputed waters of the Yellow Sea on Dec. 20. South Korea held a live-fire military drill on a border island and scrambled fighter jets despite North Korean threats of deadly retaliation, as U.N. diplomacy on the crisis broke down. Korea Pool/AFP/Getty Images
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