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North Korean leader Kim Jong-Un (R) claps as he attends the unveiling ceremony of two statues of former leaders Kim Il-Sung and Kim Jong-Il in Pyongyang on April 13, 2012.  North Korea's new leader Kim Jong-Un on April 13 led a mass rally for his late father and grandfather following the country's failed rocket launch. AFP PHOTO / Ed Jones        (Photo credit should read Ed Jones/AFP/Getty Images)
North Korean leader Kim Jong-Un (R) claps as he attends the unveiling ceremony of two statues of former leaders Kim Il-Sung and Kim Jong-Il in Pyongyang on April 13, 2012.  North Korea's new leader Kim Jong-Un on April 13 led a mass rally for his late father and grandfather following the country's failed rocket launch. AFP PHOTO / Ed Jones        (Photo credit should read Ed Jones/AFP/Getty Images)

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    U.S. doubts North Korea's hydrogen bomb claim

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U.S. doubts North Korea's hydrogen bomb claim

North Korea's claims that it has tested a hydrogen bomb have been met with skepticism by the U.S. CNN's Jim Sciutto reports.

U.S. doubts North Korea's hydrogen bomb claim

North Korea's claims that it has tested a hydrogen bomb have been met with skepticism by the U.S. CNN's Jim Sciutto reports.