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Military guard posts of South Korea (bottom) and North Korea (top) stand opposite each other as seen from in the border city of Paju on August 11, 2015. South Korea ramped up border security on August 11 as military tensions flared following landmine blasts blamed on North Korea, and the presidential Blue House in Seoul demanded a formal apology.AFP PHOTO / JUNG YEON-JEJUNG YEON-JE/AFP/Getty Images
Military guard posts of South Korea (bottom) and North Korea (top) stand opposite each other as seen from in the border city of Paju on August 11, 2015. South Korea ramped up border security on August 11 as military tensions flared following landmine blasts blamed on North Korea, and the presidential Blue House in Seoul demanded a formal apology.AFP PHOTO / JUNG YEON-JEJUNG YEON-JE/AFP/Getty Images

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South Korea bombarding North with psychological warfare

South Korea has begun broadcasting anti-North Korean propaganda after landmine blasts in the Korean DMZ killed two soldiers. CNN's Kathy Novak reports.

South Korea bombarding North with psychological warfare

South Korea has begun broadcasting anti-North Korean propaganda after landmine blasts in the Korean DMZ killed two soldiers. CNN's Kathy Novak reports.