CNN is quoting a US official saying that the blast was not nuclear.
The Japanese and Singapore press may have more information.
In a way that's even more curious.
I will say this about NK...they are a bunch of incompetent fools. Its very likely...to make the honorable Kim happy...that they were supposed to blow up a nuke...but couldn't do it. So the general's cooked up a scheme to use high explosive...and make it appear to be a nuke. What they didn't anticipate is that the US can monitor air quality and immedately tell if a nuke was used. The honorable Kim...if he reads this....will likely go blastic himself. I doubt seriously that they can mount a nuke explosive. These are a bunch of dim-witted fools...like asking the Nebraska football team to devise a solar energy plan for America...they would do something just for looks but never come up with a real plan.
Let us hope and pray that GW and his aides are raising glasses to toast the brave people who made this happen. Sabotage, if true, allows us to keep up the polite fiction that we're negotiating or willing to do so. If we'd just dropped bombs or missiles on NK, well, that's the last option. This is much better. Another notch on GW's gun, and that's what counts. Kerry, Mad Maddie, et. al, (Rather), are busy chewing their respective carpets.