they're running it through domestic intelligence as well as international. we have no idea does this have a foreign threat and foreign terrorist organization ties or is it domestic and home grown? we're not going to know that until more information comes out. right now we went from response, recovery, to investigation very, very quickly. >> let's stick with the investigation for a moment, because one of the big advantages it seems they have here, cameras everywhere particularly right at the finish line. that's number one. number two, possibly several unexpoeded bombs. that's a great place to start the investigation. >> right. the boston police sort of kept that quiet yesterday. the numbers got up to five or six. >> even if there's one. >> that is true. with the fingerprints. even the detonated devices will have possibly fingerprints, trace materials. that's going to be the forensic side. then there will be the eye witness and camera side of it.