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What is the atf and what are investigators looking at with respect to the bomb? the package. the envelope that apparently is shared amongst all of these packages, the fact it has stamps. the return address. maybe fingerprints. the idea of the white powder e here and the fact it likes like a pipe bomb looking at it. based on the physical evidence what do you think we're looking at? >> well, it's always great for bomb investigators to find an intact device. i mean, we train every single agent trained to investigate bombs and bombings and blown up bombs and blown up cars and minute fragments of b...

>> could it be the copycat that doesn't have the sophistication of the serial bomber but is trying to get in the game, if you will? go to be the serial bomber trying to try different methods? the good news is that we have a device that w hasn't been detonated. >> sean: two, one of the devices also from earlier today didn't go off. >> correct. we have these devices that they are going to take to the atf lab in virginia, totally traced, totally take apart, see how they work. like you said, they have a signature. find that signature, and they will learn how sophisticated how this device was and h...

>> sean: makes no sense. >> could it be a copycat that doesn't have the sophistication but is trying to get in the game? possibly. could it be the serial bomber trying different methods? possibly. the good news is that we have a device -- >> sean: we have two. one of the devices from earlier today didn't go off. >> correct. we have these devices that they're going to take to the atf lab in virginia, totally trace and take apart and see how they work. like you said, they have a signature. by that signature they'll learn how sophisticated this devise is and how could the person make the device. ...

>> tucker: a serial bomber is terrorizing the city of austin, texas. on sunday night, two cyclists were injured after setting off what appears to have been a tripwire connected to a bomb. it's the fourth bombing in that city in just three weeks. terry turchie is the former fbi assistant director of counter terrorism and he joins us tonight. terry, thanks for coming on. >> thank you, tucker. >> tucker: from what we knowr about these explosions, is there anything that connects them, a theme? >> well, i don't think we know of a theme that connects them. right now, the best information, tucker, we...

>> tucker: a serial bomber is terrorizing the city of austin, texas. a trip wire set off a bomb. fourth bombing in three weeks. terry turchie is director of counter terrorism. thanks for coming on. >> thank you, tucker. >> tucker: from what we know about these explosions is there anything that connects them, a theme. >> well, i don't think we know of a theme that connects them. right now the best information, tucker, we're going to have is the forensic aspect of them. that's what's going to help us at least in these initial days to try to put all of this together because people at the lab, atf...