[JJ59]

Well how about this: ComChina makes 5 suitcase nukes that are untraceable. That are not made from the materials usually used. Suitcase nukes are unusually made to begin with. Different than your average atomic bomb. My speculations of course.

[Poohbah]

You still need bomb-grade uranium or plutonium. It's not like you can go down to Osco Drug and buy it--there are a VERY few facilities in the world that produce such goods, and they are very well known, their output is very tightly controlled, and their products are easily identified via remote sensing tools. Chinese bombs will be built with Chinese materials. Those materials will be easily identified as Chinese. Allowing Osama bin Laden to detonate 5 suitcase nukes in America, leaving a nice radioactive finger pointing at Beijing, is really stupid. In return for inconsequential damage to America, the Chinese Politburo would sign their death warrant. Now, maybe Osama would be dumb enough to sign off on this. The problem is that the Chinese aren't that stupid, and they are the ones with the nukes, not Osama.