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Subject but have not released identity to the public. now what? >> we're expecting to hear from law enforcement later on today. this is important. what we heard from law enforcement officers yesterday is they are imploring the public to come forward to provide information, provide video, any photos from the scene behind me, which was the festival. the key part of that will be the identity of the suspect, getting that information out to the public, so anyone who knows big about the person can get in contact with law enforcement. having talked to law enforcement offices familiar with the investi...

Match a particular signature. that's the forensic side. and then there's the criminality, trying to get into the mindset of the person or persons responsible. one mindset relates to the people targeted. one of the most glaring being that these are democrats, progressives. brennan is the outlier. he's received a lot of rath from right-wing circles. all that will be taken together, every lead will be tracked. these law enforcement agencies will be fusing resources against the country in order to track back where this came from. i would say lastly, chris, knowing how far investigators have progre...

Individual. we don't know what drove him to this. i believe over the next few days, we will learn more about him, his background, his personality, what other prior histories he may have had as well. >> what's the work that's being done outside of that interrogation room with this suspect? >> a lot has been done, particularly around the forensic side. there are going to be search vehicles around his residence that he lived in or may have lived in. what he owned or operated. we're going to get a lot more assessment from his family and friends. this is going to be a longstanding investigation. fo...

They're running it through domestic intelligence as well as international. we have no idea does this have a foreign threat and foreign terrorist organization ties or is it domestic and home grown? we're not going to know that until more information comes out. right now we went from response, recovery, to investigation very, very quickly. >> let's stick with the investigation for a moment, because one of the big advantages it seems they have here, cameras everywhere particularly right at the finish line. that's number one. number two, possibly several unexpoeded bombs. that's a great place to s...