Im going to assume it was another piece of space junk falling out of orbit.
But that may just be because I watched a TV show about just that the other day and was absolutly stunned as to how much crap falls out of the sky.
Most of the time it goes un-noticed lilke out in the middle of the pacific but once in a while a chunk plops into a farmers field somewhere.
Heh.. a funny piece of trivia when skylab crashed to earth several years ago there was great fear of devistation and carnage. Well it did fall through the atmosphere and break up. Total casualtys? One cow