http://en.wikipedia.org/wiki/Suitcase_bomb

The Russian government's statements on this matter have been contradictory. First they denied that such weapons had ever existed; then they said that all of them had been destroyed. The best available information suggests that several hundred suitcase nukes were manufactured, but that they have a shelf life of at most a few months in between maintenance and parts replacement. Even if rumors that some suitcase nukes were stolen in the period between 1989 and 1992 are true, it is highly unlikely that they still would produce nominal yield. Most likely, an attempt to detonate one of these devices would scatter plutonium, but not produce any fission.
So it appears that there is no concrete information of any bombs actually stolen.


CBR