South Korean army soldiers stand guard at Unification Bridge near the border village of Panmunom in Paju, South Korea, Friday, August 21, 2015. South Korea fired dozens of shells Thursday at rival North Korea after the North lobbed several rounds across the world's most heavily armed border and threatened to take further action unless Seoul ends its loudspeaker broadcasts. The North denied it fired any shots and warned of retaliation for what it called a serious provocation. (Photo by Ahn Young-joon/AP Photo)
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