If they did, I doubt if they would tell anyone about it 1st.
http://news.yahoo.com/s/ap/20060321/ap_on_re_as/nkorea_us

i wouldn't look at it as a threat. they're just flexing their little muscles in order to get a little extra out of the US. they are smart enough not to use them. they only have a few and we have enough to knock them out of the air on the way in and land about 50 of them anywere we want as a counter.
just a bunch of blow hard politics.

You know what you do when a mosquito annoy's you, you smack it and end its terrible little existance. You know what the U.S. is gonna do if N. Korea tries something, smack it, and end its terrible little existance.

Sure, they may have a couple. Enough to get through our defenses? Probably not, we have enough to destroy the earth 3X over. They also don't have the old super power of Russia baking them up anymore. So let them talk and if they try and show a little muscle, then "SCHMACK!!" No more annoying mosquito.