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Bombs to the post office and there may be more than one bomber here. there may be an accomplice as well. they could carry -- the thing about carrying ten bombs, frank's point, they might have been mailed at once, could have been mailed multiple times. think about lugging these things around in your vehicle, as clint would say, pre-offense behavior we -- >> say that again. >> pre-offense behavior, just before. you can't safely lug these kind of contraptions around without the risk of them blowing up on you unless you have a safe arm switch. a safe arm switch would be that digital alarm clock th...

The information we're getting is they were real. they could actually have exploded. what about what we know about this is going to help us figure out who and why? >> you've got to look at the make-up of the bomb. you look at the bomb carefully to see if you can zurn who the bomber is. you talked about a timer, it's been reported the bomb has a timer. timers aren't normally used in mail bombs. a digital timer here is most likely a safe arms switch. it's used by the bomber so he can carry the package, manipulate the package, put it into the mail stream, get it out of his car and it won't detonat...

Is this bomber? >> yes, he's adept at making the fusing and firing systems. we sort of wigged out about the trip wire. but look, the process to rig a device, one way to do that is an interior trip wire. you open the lid. the string pulls the contact. to go to a trip wire, you just put a longer string. it's not that much of a sophistication necessarily. he's mastered the little micro switch that either detonated the device when you open it or tilt it or move it. we call it anti-disturbance device. he has a trip wire. now he's going back to a package device. he may have a safe arm switch. here's...