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Painted black. a large bolt tied off with a fishing line and acting as a drop weight would fall on a rat trap causing it to strike a firing pin. kind of like a rube goldberg device. the author also said there was a second secret triggering device as backup. either way the bomb was designed to go off when roberto ayala opened the door of the electrical box. could have been almost anything. now suddenly agent parker saw how they all fit. those confusing bits and pieces he'd been poring over for the past month. >> it was almost like someone had sent us the cover of the puzzle box. >> reporter: so...

I had never seen anything like that before. >> reporter: the device as shown in the diagram was a two-inch pipe bomb placed next to a one-liter soda bottle full of gasoline, spray-painted black. a large bolt tied off with a fishing line and acting as a drop weight would fall on a rat trap, causing it to strike a firing pin, kind of like a rube goldberg device. the author also said there was a second secret triggering device as backup. either way the bomb was designed to go off when roberto ayala opened the door of the electrical box. >> it could have been almost anything. >> reporter: now sudd...

Diagram was a two-inch pipe bomb placed next to a one liter soda bottle full of gasoline spray painted black. a large bolt tied off with a fishing line and acting as a drop weight would fall on a rat trap causing it to strike a firing pin. kind of like a rube goldberg device. the author also said there was a second secret triggering device as backup. either way the bomb was designed to go off when roberto ayala opened the door of the electrical box. could have been almost anything. now suddenly agent parker saw how they all fit. those confusing bits and pieces he'd been poring over for the pas...

Fishing string attached just under the head of the bolt which was how it was depicted in the diagram. >> it would have been hanging from that string as a weight. >> correct. right. so that was very clear that that bolt was in fact part of our device that was described in the letters. >> reporter: and there were fragments of a plastic soda bottle, black paint still clinging to it again just like the diagram. >> there was a spring that was similar to a rat trap spring. there was gasoline on the victim's clothing. that we were able to determine that had no business being in that panel. >> reporte...

>> almost as someone sent us a cover to the box. >> they matched the bits to the diagr diagram. >> the first thing i looked for was the bolt. there it was. >> the thing that made it exceptionally clear was the fact the bolt still had some fishing string attached just underneath the head of the bolt which is how it was depicted in the diagram. >> so it would have been hanging from that string? >> correct. >> as a weight? >> right. and so that was very clear that that bolt was, in fact, part of our device that was described in the letters. >> and there were fragments of a plastic soda bottle. bl...