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South Korean military trucks are on standby in the demilitarized zone separating North Korea from South Korea in Paju, about 55 km (34 miles) north of Seoul, in this July 7, 2006 file photograph. North and South Korean troops along their heavily fortified border exchanged gunfire for the first time in about a year, a military official said on August 1, 2006, with the incident coming as once-warming ties have turned chilly. [Reuters]