Originally Posted by **********

That is correct. A nuke that catches fire may explode thanks to other factors such as the chemical propellents catching fire. It would not cause a "nuclear" explosion but the radioactive plutonium would scatter causing lot of deaths, cancers, etc. It is essentially what a "dirty bomb" is. Take some radioactive material, sprinkle it on some TNT (maybe add salt for seasoning) and blow it up. A city block made radioactive.