On Thursday, a U.S. lawmaker revealed at a congressional hearing in Washington an excerpt from a recent U.S. intelligence report compiled by the Pentagon's Defense Intelligence Agency, which concluded with "moderate confidence" that North Korea had mastered the ability to affix a miniaturized nuclear warhead to a ballistic missile.

WSJ: U.S., South Korea Offer North Talks, and a Warning

And a section in a new Defense Intelligence Agency assessment concludes with "moderate confidence" that the North could deliver nuclear weapon by ballistic missiles.

NPR: A Look At The North Korea Crisis