enforcement officials say they don't see this as a large scale, meaning many, many perpetrators involved, but again, they say that's based on preliminary investigation. anderson, one of the things they're being candid about tonight is a lot of these details, they simply don't know. >> yeah. that's important to recognize. again, i will repeat this a lot tonight, it is important to recognize what we don't know at this hour. it is very early hours in this investigation. john, i appreciate it. we will continue to work our sources. i'm joined right now by a couple of people who have a lot of good information. former u.s. assistant secretary of homeland security, massachusetts homeland security advisor and cnn contributor, julia kaiam will join me here. fran townsend, also homeland security advisor and member of the homeland security and cia external advisory committee -- excuse me, cia external advisory boards. also, with us cnn contributor and former fbi assistant director tom fuentes.