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Terror attack. investigators now know what materials were used and how they were detonated. molly line is live in boston. tell us, what are we learning about the bombs, molly? >> reporter: well, jon we are learning from a joint intelligence bulletin sent out to local state and federal investigators a little more forensic analysis, essentially that the bombs were not actually identical and that they relied as catherine herridge mentioned a few moments ago on remote controlled car parts. the bullying goes ton to say that each device likely incorporated an electric speed controller used as a swit...

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Review by fox news concludes based on new forensic analysis that the boston bombs most are likely relied on component from remote controlled toy cars for the detonation. the fbi and homeland security bulletin to local state and federal law enforcement reads, in part: each device likely incorporated an electric fusing system using components from remote controlled toy cars such as a transmitter and receiver pair. electric speed controller used as switch mechanism. asked mike mccaul who is regularly briefed on the investigation to explain what catches his attention. >> this transmitter that was ...