so basically that's telling me they're looking at random targets. they're not predetermined targets. >> this is americana, right? do they hate suburban america? we don't figure out why they were doing it. but they were striking kind of right at the heart of the suburbs. >> you had 9/11. this is one year later. at first, we're not sure if we have a terrorist operation. >> there was no sense at all who was behind this, who the next victim might be, when it would stop, if it would stop. >> we didn't know what the next 16 hours was going to bring. >> the snipers began leaving notes. >> it was sort of like getting punched in the face. it doesn't operate out of basements or back alleys.