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Caption:INCHEON, SOUTH KOREA - OCTOBER 04: South Korean unification minister Ryoo Kihl-Jae (R) shakes hands with Hwang Pyong-So (L) vice chairman of North Korea's National Defense Commission on October 4, 2014 in Incheon, South Korea. The North Korean delegation, including Hwang Pyong-So, who is thought to be the country's No.2 after Kim Jong-Un, made a surprise visit to South Korea to attend the closing ceremony of the Asian Games. (Photo by Chung Sung-Jun/Getty Images)
Caption:INCHEON, SOUTH KOREA - OCTOBER 04: South Korean unification minister Ryoo Kihl-Jae (R) shakes hands with Hwang Pyong-So (L) vice chairman of North Korea's National Defense Commission on October 4, 2014 in Incheon, South Korea. The North Korean delegation, including Hwang Pyong-So, who is thought to be the country's No.2 after Kim Jong-Un, made a surprise visit to South Korea to attend the closing ceremony of the Asian Games. (Photo by Chung Sung-Jun/Getty Images)

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North and South Korea exchange fire at border

CNN's Brian Todd reports on the shelling between North and South Korea over propaganda on loudspeakers.

North and South Korea exchange fire at border

CNN's Brian Todd reports on the shelling between North and South Korea over propaganda on loudspeakers.