let me start with you, jim maxwell, since you're here.'re a retired special agent who specialized in the bomb area. this is the kind of bomb that we're talking about, a pressure cooker. fairly crude device but in this case, extremely effectively executed. what do you make of the development today with the two suspects given that it clearly shows a team? >> yes. this type of device basically, based on what i've seen so far, would be used to deliver low explosives, something that moves 3300 feet per second, less than that amount. and this device is popular for low explosives, the common vessel would be a pipe bomb. well, in this particular case, they decided to use this kind of vessel and what it does is it allows low explosives to build up pressure inside the vessel and then it will increase the potency of the explosion by containing that pressure. >> bob baer, let me bring you in here. every day we've talked we found a little bit more. today, a big, big development. do we know any more about who is more likely to have done this, home-grow

. >>> joining me is jim maxwell, cnn contributor and former cia operative bob bair. i spoke to you earlier. we have what the fbi would seem to be a significant development in terms of a new picture. what do you make of that? >> i can tell you this is a classic example throughout my career, every investigation, every successful investigation, is hinged on the cooperation of the public. good citizens out there, willing to raise their hands, step forward, make a statement, testify in court, provide information. and this is a classic example of that. this photo now gives us direction. we know which direction at least one of the bombers started to head as the bomb went off. hopefully, other video and photo will ultimately extend where he was headed or maybe who he hooked up with at the end. >> bob, let me bring you in here. clearly, things happening at quite a pace now. this new image gives us a much clearer picture of one of the suspect's faces. there's also this strange situation of some shoes on the floor. we have no idea if it's any connection to him at all. of course