Ghost Rockets

Also know as "Roswell Rods"
Reported in Sweden after Hiroshima bombing
Cigar shaped, often with "fins"
Often mistaken for "alien craft"
Rods are thought to be living organisms, yet no dead bodies!
From the Rod FAQ:
Actually Rods can be seen with the naked eye once you know what they look like and have conditioned yourself to see them.
http://www.crystalinks.com/rods.html and Roswell Rods