>> they've been working on this and thinking about this for some time. during that entire time period, there are some red flags. who did they talk to? what did they look at online? who did they talk to online? did they expand their circle of influence? were they talking about this type of attack with friends, with co-workers? this is the challenge for law enforcement right now. as just reported there's multiple crime scenes. each crime scene has multiple work streams. we're looking at physical searches, interview process and digital forensics. combining all of that will lead to ascertaining what exactly the motive was. we have the suspect and accomplice in police custody. whatever they're saying, it has