stuff. >> exactly. it begs the question were they planning additional attacks? the third pressure cooker bomb they used in the pursuit, was that supposed to be deployed by a third person the day of the marathon? these are unanswered questions that i know law enforcement is working hard to try to resolve. >> could profiling have made a difference in this case? how do you determine if they were part of a larger cell? >> profiling is kind of a bad word, we don't like profiling. >> but you have profilers. >> we have people that do profiling. one of the things i think that would help, we have the ability to do behavioral observation. we have behavioral -- alerting behavior. for instance, if we were going to boston marathon, we were friends or brothers, we would be walking side by side talking to each other about it. yet the individuals on race day were one to five feet apart, unusual, there are people the cameras would have picked up,