indication of motive? if there's an international dimension, who trained them, et cetera. but you look at the tape around those devices, is there a fingerprint on one of those pieces of tape? think about climbing a mountain and it looks like a piece of glass. you want one finger hold, a hair, a piece of dna, some mistake when the person mailed the package, right now, i'm not worried about why they did it, i'm worried about one hand hold on a glass mountain that allows me to say game on, we're going finish this. >> just take us inside an investigation, what will investigators be looking for at this facility to help them narrow down what happened? >> well, at this facility, this is one stop in what the fbi is doing in tracing the journey of each of these devices. they're trying to go from the point of arrival. every field office in the jurisdiction where one of these