Triggered Charge Clusters in Metal explain the glowing hot Aluminium (melts before it glows ordinarily) and seemingly 'red hot' steel re-bar weeks after towers dustified.

With electromagnetic triggerring of Charge Clusters (think ball lightening) in metal, you can make it glow cold, make it turn to liquid - cold, atomise and float - all of these things are in NIST photos, videos and vocal testimony.

None of these things is possible with Nukes.