Spokesman Josh Earnest said the White House had concerns about the "destabilising actions" of the regime, but said available information "calls into serious question" claims that Pyongyang has a thermonuclear device.
During a recent inspection tour of a historical military site, Kim mentioned that North Korea was already a "powerful nuclear weapons state ready to detonate self-reliant A-bomb and H-bomb to reliably defend its sovereignty," the North's official KCNA news agency said today.
North Korea has already tested three atom bombs, which rely on nuclear fission.
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