U.S. Secretary of State John Kerry says it would be a "huge mistake" if North Korea follows through on its threat to conduct another missile test that officials warn could happen at any time.
Tensions on the Korean Peninsula
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A North Korean man blocks his face with his hand from being photographed as he and other residents take a ferry in Yalu River, near the North Korean town of Sinuiju, opposite the Chinese border city of Dandong, April 11, 2013.
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People take part in an oath-taking before the statues of late North Korean leaders Kim Il-sung and Kim Jong-il on Mansudae Hill in Pyongyang, April 10, 2013. (KCNA)
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Anti-North Korean protesters release balloons with peace messages on the Grand Unification Bridge leading to the North near the demilitarized zone separating the two Koreas, in Paju, north of Seoul, April 10, 2013.
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South Koreans arrive with their belongings from North Korea's Kaesong at the customs, immigration and quarantine office near the border village of Panmunjom, in Paju, north of Seoul, South Korea, April 9, 2013.