what are you hearing? >> remember throughout the day >> tom, i keep coming back to yesterday, we were showing a the olympic park bombing, which photograph of an object of some kind and it was in front of one you were deeply involved with. they had -- because of richard of the barricades and this is before the blast. and we were trying to piece jewels' ability to actually spot together what was that. could that have been the device. the device, call over law en forssment, they had trained well, tonight we have a officers who looked at the device, got eyes on it before it brand-new photograph that was taken about an hour before that. explode and had were able to these photographs provided to us evac sate the area to some by a man who was -- whose wife degree. and that investigation still was running in the marathon, and took months, as we have talked about, even though they got eyes he was watching her. on the device before it and that's when he snapped this exploded. the difference this time around photograph. the difference being that an hour earlier, that same object, is the preponderance of cell phone cameras, the huge number who knows what it was, was of pictures and photographs of inside that barricade. this area. that is clearly the instrumental not outside, like that earlier part of this case right now. photo that we saw provided to us by a local television station >> yeah, that is one difference. the second is that that bombing here. so the question, of course, is took place at about 1:10, could that have been the bomb device. 1:15 a.m. the main camera was actually on we don't have the answer for that tonight. but it's interesting to note, cnn headquarters, pointing down into centennial park. the movement of that object. but it was still dark. however, we want to try to and once the smoke goes out, explain that at this point. it's very difficult to see >> and that object was on what's going on. and there's not as many -- the that -- in that spot, moved, all