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Peter moore, whose family owned the farm, did not like roberto. he even admitted he had challenged roberto to a fight. investigators were zeroing in on peter. then a mysterious clue would land right on their doorstep. it was a letter. and whoever wrote it had serious inside information. here again is keith morrison. >> reporter: the bureau of alcohol, tobacco and firearms has become something of a legend at solving puzzles, these little bits and pieces, fragments of this and that were about all that was left around roberto ayala's body the day of the explosion. a story in there somewhere thoug...

It was a letter. and whoever wrote it had serious inside information. here again is keith morrison. >> reporter: the bureau of alcohol, tobacco, and firearm has become something of a legend at solving puzzles. these little bits and pieces. fragments of this and that were about all that was left around roberto ayala's body the day of the explosion. story in there somewhere, thought the atf. agent brian parker was assigned to find out what it was. >> what does this tell you overall? >> well, what it tells us is that there was an incredible amount of force in the explosion. >> most of these piece...

One thing was clear, peter moore, whose family owned the farm, did not like roberto. he even admitted he had challenged roberto to a fight. investigators were zeroing in on peter. then, a mysterious clue would land right on their doorstep. it was a letter. and whoever wrote it had serious inside information. here again is keith morrison. >> reporter: the bureau of alcohol, tobacco, and firearms has become something of a legend at solving puzzles. these little bits and pieces, fragments of this and that were about all that was left around roberto ayala's body the day of the explosion. a story i...

Has become something of a legend at solving puzzles, these little bits and pieces, fragments of this and that were about all that was left around roberto ayala's body the day of the explosion. a story in there somewhere thought the atf. agent brian parker was assigned to find out what it was. >> what does this tell you overall? >> what it tells us is there was an incredible amount of force in the explosion. >> reporter: most of these pieces were once part of the electrical box. >> you have washers. different types of hardware in here, screws, nuts, wire. >> reporter: other pieces just trash. b...

At solving puzzles, these little bits and pieces, fragments of this and that were about all that was left around roberto ayala's body the day of the explosion. a story in there somewhere thought the atf. agent brian parker was assigned to find out what it was. what does this tell you overall? there was an incredible amount of force in the explosion. >> reporter: most of these pieces were once part of the electrical box. >> you have washers. different types of hardware in here, screws, nuts, wire. >> reporter: other pieces just trash. but a few fragments, just a handful looked like they were pi...