It is caused by thermal radiation from the flash of the initial explosion. Since the light travels from a central point it burns everything directly in its path but if its path is interrupted by something (a person/object) the area shielded from the light will be left relatively untouched. These burns can happen miles and miles away from the explosion in areas otherwise unaffected by the bomb.
Since thermal radiation travels in straight lines from the fireball (unless scattered) any opaque object will produce a protective shadow. If fog or haze scatters the light, it will heat things from all directions and shielding will be less effective. Massive spread of radiation would also occur, which would be at the mercy of the wind.
It seems that they have also found shadows of people but not their bodies (which were instantly vaporized by the heat of the explosion.)
Midnight in a perfect world (Nuclear Explosion Compilation)
http://www.youtube.com/watch?v=XabiH5IRiKc
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