[AppyPappy]

That's what people don't realize. You can put a warhead in a Ryder truck and do the same thing. Only they leak after a while. My understanding is they are easy to find with detectors.

[Old Ivan]

One non-explodable plutonium warhead. One sack of ammonium nitrate. Grind finely. One spark. A lot of smoke. And most of NY will be uninhabitable for the next 30000 years. Note: no nuking, just chemistry...