here, is there an opportunity for investigators to pick up exactly who is behind this? >> there's going to be a ton of evidence in this, alex, and i think we will find out who did this. the vehicle itself will have identification numbers, although it has been tampered with. within the vehicle fingerprints, registration papers, even the materials put together -- all of those will have a trail of forensic evidence that hopefully will lead back to an individual. if it is a sole individual, it may take a while to find out who this person is. >> we've been hearing from pete williams the v.i.n. numbers they thought had been obliterated and now they're finding them else or on the car. that will help trace down who is behind this. given the materials in the suv, michael, can you get a sense of how this detonated, how large was an explosion this would have