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Visitors look at the North Korean side through binoculars at Dora Observation Post in the demilitarized zone (DMZ) near the border village of Panmunjom that separates the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, Wednesday, May 26, 2010. North Korea threatened Wednesday to block all cross-border traffic and blow up any South Korean loudspeakers blasting propaganda northward after a six-year hiatus, as tensions soared over the sinking of a South Korean warship. (AP Photo/Lee Jin-man)