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It's hard to believe what is going on. >> he seemed like a -- a very normal kid which is what everybody says -- or most neighbors say in these type of situations. but over the years, there is nothing that i could point to. >> reporter: now that normal kid is accused of a string attacks with package bombs. a couple that were deadly. let's get back to the investigation. you touched on the foreign or exotic batteries as agents call them. this is what they used, and ordered online from asia to tie the attacks together. terrific work from nbc news investigative team discovering that and other key c...

Sixth bomb was intercepted before it was detonated. another key piece that allowed officials to tie all this together, surveillance video that the suspect was seen at that fed ex-facility dropping off packages. the fbi also was able to come up with a list of phone numbers of individuals that were in the same areas of the bombs. because they were able to track cell founds, they use cell site analysis that can find callers in certain areas. two officials say before the confrontation over night, the suspect turned on his cell phone, and that is another key piece of information on how they were ab...