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Backpacks so they've been bounced around. you're walking down a street. fusing and firing system in there is being jostled a little bit. you know, we don't know until the fbi lab comes back and the forensic etf guys look at it all but, you know, it looks like there is a chance -- these are remote controlled and command detonated devices so they are placed, if it turns out to be they're command detonated which looks to me like it is based on the timing and placement and the circuitry i've seen -- that is a pretty good bomb. it takes a little instruction and training. maybe a little practice. it...

Detonate. they all reliably detonate. they've been carried in backpacks so they've been bounced around. you're walking down a street. fusing and firing system in there is being jostled a little bit. you know, we don't know until the fbi lab comes back and the forensic etf guys look at it all but, you know, it looks like there is a chance -- these are remote controlled and command detonated devices so they are placed, if it turns out to be they're command detonated which looks to me like it is based on the timing and placement and the circuitry i've seen -- that is a pretty good bomb. it takes ...

Concern for the person's well-being, which is genuine, but it's also some way to diffuse the situation. this guy was pretty weak, craig. he had been bleeding all night. he's not a big guy and he lost a lot of blood. he might have been shot again in that volley of 20 shots or 40 shots. >> and no food as well all day yesterday. >> that's true. >> based on the caliber of the bombs used, both at the marathon and during the chase, james, how sophisticated were these devices? >> well, you know, they're very simple really but they're effective. the fact that some powder was found by the police and ag...

Uni bomber and eric rudolph, that took a very long time to solve. does it make it a more difficult case to solve if you are dealing with an individual as opposed to a group? >> well, not necessarily. because you know, when you're on your own, you're alone. not only do you have to make the fusing and firing system, you have to purchase the components, deliver the device. you've got a chance of being seen. then you could have a couple of conspirators of multiple

Your own, you're alone. not only do you have to make the fusing and firing system, you have to purchase the components, deliver the device. you've got a chance of being seen. then you could have a couple of conspirators of multiple conspirators as well. >> all right, grant fredricks and james cavanaugh, thank you both for your time tonight. i appreciate i. coming up, more on the national reaction to the attack. we'll be right back. ♪