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Associated Press
South Korean marine's K-55 self-propelled howitzers are covered by smoke during a military exercise in the border city between two Koreas, Paju, north of Seoul, South Korea, Tuesday, April 2, 2013. North Korea vowed Tuesday to restart a nuclear reactor that can make one bomb's worth of plutonium a year, escalating tensions already raised by near daily warlike threats against the United States and South Korea. (AP Photo/Lee Jin-man)

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