North Korean leader Kim Jong Un, center, visits the Phyongchon Revolutionary Site, in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang, Dec. 10, 2015.
December 10, 2015 6:42 AM EST

BEIJING — North Korea’s leader Kim Jong Un has claimed his country has developed a hydrogen bomb, a significant step forward from the less powerful atomic bomb.

The official Korea Central News Agency reported that Kim made the comments as he toured the Phyongchon Revolutionary Site, which marks the feats of his late father Kim Jong Il and grandfather Kim Il Sung.

The work of Kim Il Sung “turned [North Korea] into a powerful nuclear weapons state ready to detonate a self-reliant [atomic] bomb and [hydrogen] bomb to reliably defend its sovereignty and the dignity of the nation,” KCNA quoted Kim Jong Un as saying….

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