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Nightmare. as investigators sift through evidence, the bits of bomb blown across the crime scene should yield other clues, too. >> what were the components used in creating these devices? coupled with that, you're going to have an investigation or laboratory sciences working on things like fingerprints, hair and fibers that may be included in there. and also tool markings. >> ray low pez is a former fbi explosives expert. they're going to look for tool marks that were left after these things were done. and that's going to be matched to any tools that they could find at any of the search sites ...

A pipe bomb. does that shake your faith that there were others involved? >> oh, no, not at all. i've made so many of these myself that it's really hard to make the detonators work and electronics. you need practice. if you do this stuff on your own, yes. if you do this as a job, work with your hands, yes, but i don't think neither of these two men did. but on the other hand, there's no explosives expert will tell you need hands-on practice for a very long time, especially when you're making these things go off under pressure like a gun fight, or you're placing bombs. you just can't count on pe...

Myself that it's really hard to make the detonators work and electronics. you need practice. if you do this stuff on your own, yes. if you do this as a job, work with your hands, yes, but i don't think neither of these two men did. but on the other hand, there's no explosives expert will tell you need hands-on practice for a very long time, especially when you're making these things go off under pressure like a gun fight, or you're placing bombs. you just can't count on people -- >> you've actually made these devices? >> yes. i was down in huntsville two years ago and atf runs a course down th...

Yield other clues, too. >> what were the components used in creating these devices? coupled with that, you're going to have an investigation or laboratory sciences working on things like fingerprints, hair and fibers that may be included in there. and also tool markings. >> ray low pez is a former fbi explosives expert. they're going to look for tool marks that were left after these things were done. and that's going to be matched to any tools that they could find at any of the search sites that investigators are working at. >> officials now say at least one of the bombs was detonated with a r...

>> as you said, bob, you were skeptical of this whole idea they built these devices on their own or didn't have some sort of guidance in a way. susan candiotti reporting based on one single source in law enforcement that one of the bombs, the suspects allegedly used against police during the gun fight last week in watertown, involved an elbow pipe which is similar to what's in an al qaeda magazine and is sort of known as being a device from that al qaeda magazine. i guess it's not kind of the regular way to make this kind of a pipe bomb. does that shake your faith that there were others involv...