[Nowhere Man]

Hmmm, clouds that catch fire, come to think of it, I've read about something similar in a "Dragon Magazine" (role playing gamer magazine) article on integrating UFO's, the paranormal and other such conspiracies into your gaming campaign. It predates the "X-Files," it was written in 1992. The article was well researched with references and what you describe reminds me of an alleged secret Nazi weapon during World War II. The story from a witness was that a Nazi flying saucer or plane was flying over Italy, sprayed some sort of blue mist around a US B-17/B-24 bomber and the plane's exhaust caught the mist on fire and the plane blew up, sort of like an airborne version of a fuel/air bomb.

Disclaimer, I know this is tin-foil hat territory and I cannot vouch if this is true or false, but I decided to bring this up.

[Quix]

Interesting. I hadn't heard of that before in any of my vast collection of puzzle pieces.