AP, Fox News, and the North Koreans are saying its nuclear. State Department and the Koreans are saying its possible and looking into it. It’s in almost the exact same spot as the 2006 test and folks have been saying a test is coming soon.
http://www.foxnews.com/story/0,2933,521617,00.html
Particularily good timing is this editorial by John Bolton in the WSJ on Wednesday “Get Ready for another North Korea Nuke Test”
http://online.wsj.com/article/SB124277648950937029.html