Not the link of US saying they have that program but NKorea stating so.
"Where is the link to the article where NKorea actually admits working on a nuclear program?",
"The refusal by the United States to negotiate with North Korea over its nuclear program could lead to an "uncontrollable catastrophe," North Korea's state-run Rodong Sinmun newspaper has warned.
In the event of a nuclear conflict, he said, North Korea would deal a "merciless punishment" to the United States."
"North Korea warns of 'catastrophe' " http://www.freerepublic.com/focus/news/811868/posts