South Korean army K-55 self-propelled howitzers move during an exercise against possible attacks by North Korea in Pocheon, South Korea, near the border with North Korea, Wednesday, March 27, 2013. North Korea said Wednesday that it had cut off a key military hotline with South Korea that allows cross border travel to a jointly run industrial complex in the North, a move that ratchets up already high tension and possibly jeopardizes the last major symbol of inter-Korean cooperation. (AP Photo/Ahn Young-joon)

Associated Press
South Korean army K-55 self-propelled howitzers move during an exercise against possible attacks by North Korea in Pocheon, South Korea, near the border with North Korea, Wednesday, March 27, 2013. North Korea said Wednesday that it had cut off a key military hotline with South Korea that allows cross border travel to a jointly run industrial complex in the North, a move that ratchets up already high tension and possibly jeopardizes the last major symbol of inter-Korean cooperation. (AP Photo/Ahn Young-joon)
South Korean army K-55 self-propelled howitzers move during an exercise against possible attacks by North Korea in Pocheon, South Korea, near the border with North Korea, Wednesday, March 27, 2013. North Korea said Wednesday that it had cut off a key military hotline with South Korea that allows cross border travel to a jointly run industrial complex in the North, a move that ratchets up already high tension and possibly jeopardizes the last major symbol of inter-Korean cooperation. (AP Photo/Ahn Young-joon)
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