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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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Reports: N. Korea shoots at S. Korean loudspeaker

North and South Korea exchanged artillery fire after the North fired a shell toward the South, an official with the South Korean Defense Ministry tells CNN. Kathy Novak has more.

Reports: N. Korea shoots at S. Korean loudspeaker

North and South Korea exchanged artillery fire after the North fired a shell toward the South, an official with the South Korean Defense Ministry tells CNN. Kathy Novak has more.