strong suspicions that the tsarnaevs may not have acted alone. what do you think? >> jake i've heard the same thing from people involved in the investigation, fbi consultants, they didn't act alone, and the sense that they were shown how to make these bombs. tamerlan probably had some combat training when he went to dagestan the year before. but the device -- original said it was downloaded from the internet from the "inspire" article. but it was actually improved upon and there's a question whether there was actually somebody in boston at the time because they never sound a circuit tester in dzhokhar's apartment or the other apartment. so how did they actually make this bomb? and it was fairly sophisticated, the six-second delay and the rest of it. and categorically, explosives experts have told me they had some sort of assistance either in the united states or in dagestan. >> brad questions about whether the tsarnaevs could have done