On the kind of quieter side of the investigation, investigators are piecing together every aspect of this person's life. first, to find out if there is anyone else that he was working with, anyone else who might be planning to stage a follow-on attack or copy cat attack, we want to protect people first. but second, to understand why this person did what he did. so they will be -- they are executing the search warrants. they'll be looking through all of his property, talking to all of his family, all of his associates, and most importantly, looking for every communications facility, as we talk ...