But the early analysis seems to indicate that unlike the [link|http://www.usatoday.com/news/world/2004-09-11-nkorea-explosion_x.htm|2004 explosion] there was likely a nuclear explosion in this case.

I'm sure we'll know more in a few days. I suspect something will show up on the [link|http://www.fas.org/main/home.jsp|FAS] and at [link|http://www.thebulletin.org/index.htm|The Bulletin of the Atomic Scientists] pretty soon.

Cheers,
Scott.