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And caused a lot of damage. if it had the proper contents in it, proper explosive material. it seems with these devices, you really don't have that level of sophistication. as a result, you know, what you probably have is an inadequate device for an explosives effort, but very adequate in terms of causing alarm and fear. >> sam, what about the misspelled names? on more than one of these packages, things were misspelled. does that, i don't know, does it help you build a profile or a bomber or ring true in what you have seen in the past? >> you know, over the years. that's one of the things that...

This is probably too small depending on the fill, to be a detonation. it doesn't mean that if it went off it wouldn't have hurt whoever was next to it. >> important information you guys are offering up. sam, the fact that all of these, it appears all of these traveled through the mail, does it surprise you that no one was hurt? >> i'm sorry, i didn't hear the last portion. >> does it surprise you no one was hurt if all of these traveled through the mail? >> to jimmy's point, it goes back to the motivation of this potential bomber, whether he in fact or she wanted to have these devices go off. ...

Intent not to have the bomb explode, but only intimidate. you won't know that until you know who has done it. >> and how do you get there? let's find out. joining me now, jimmy oxley, explosive expert and sam roboty, a former atf special agent in charge of the philadelphia division. thanks, guys. i appreciate it. let's talk about one bomb. the bomb that came to cnn. law enforcement say it used pvc piping, explosive powder, glass active shrapnel, a digital clock linked to a battery, put in a manila envelope with those six american flag stamps. you can see here, the x-ray of the bomb courtesy of...

Packaging. and some of misspellings that you may find occasionally or just a return address that doesn't quite look right. we asked folks to be very vigilant when you look at something. if it doesn't look right, to call 911. so that was maybe a potential clue, and obviously, with all the media coverage the last 24 hours, that in fact is what kind of happened today, and the discovery of the additional devices. >> and then, of course, the question is what is the one clue that's going to lead all the law enforcement all over this to this person or persons. we'll see. but i appreciate it. sam, jim...