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Into opening a box. he's likely to change again, stef. i mean, you're perceptive in seeing this because he's likely to change. he might change the time delay. he could change to a different way to plant the device near a vehicle or under a vehicle or somewhere else. but he's very clever not going into the commercial areas. now, this bomb sent to fedex can give some great leads because he probably did have to go to a commercial fedex drop. he may be on camera. of course, he may be wearing a hood and sunglasses but he may be on camera. there's other forensics the atf lab can glean from that. i k...

Brian: brian manly joins us now with the latest on the investigation. brian, what has transpired overnight to maybe gets you closer to finding out who is behind this? >> you know, what we did into the evening hours last night was continue to process the scene. as you can imagine an explosion creates quite a debris field. we are fortunate that we had a lot of assistance from both the fbi and the atf and they worked into the late evening hours collecting all that evidence that then will be analyzed at the atf lab trying to piece this together. steve: sure. okay, so, chief, to recap over the last...

But sometimes the detective work is more hands on. that's where walter comes in. >> similar to the bush master, which was used by the washington area snipers. >> he is one of the agency's top ballistic experts. he testified at the d.c. sniper trial. >> we couldn't do our job without the agents. the agents couldn't go on with their investigation without our laboratory reports. >> walter helps tracks bullets from atf raids like the one of chicago's south side. after the atf's special response team finishes its work, it's here at the atf lab where the gathered evidence is analyzed. >> we get fire...