hours, or we'll need your help finding him or he's long gone. >> it is extraordinary, just the omnipresence of cell phone cameras, how it has changed everything. and it appears aided in this investigation. >> that's what they knew. when they came out on monday, tuesday was just particularly sort of -- desperate is the wrong word. just asking people to come forward. >> there had been a lot of concern yesterday afternoon that they were learning more about the device itself, devices themselves, that they didn't have -- they weren't very far along on any kind of suspect. whether or not they had information then they weren't giving out or the break was made subsequent to that afternoon press conference, we don't know. >> right, exactly. by the time i finally went to sleep at about midnight, i had had a conference with someone in boston police who sort of implied that this was going to be a long haul and everyone should get some sleep. >> 30 different government agencies involved, one very easily could be obsessing over this manufacturer, where they were sold, but at the same time, if you're processing the video and see an image, and cross