STEPHANOPOULOS: OK, Cecilia, thanks very much. Of course, President Obama will be there later today. We want to get more on James Holmes now from our justice correspondent, Pierre Thomas, who has more on the investigation, and everything we're learning so far, Pierre, this was a cold-blooded, premeditated plan.
PIERRE THOMAS, ABC CORRESPONDENT: Cold-blooded, meticulous. He took months to amass his arsenal. He developed an execution plan that he put in place that worked to perfection, according to my sources. Also, the time and effort in terms of putting together that booby-trapped apartment shows the intensity and focus.
I was struck by one source today who said that this was really like a mad scientist, really like a villain in a movie.
STEPHANOPOULOS: And he was pulling in materials for a couple of months at least, getting lots of packages at home. We know he bought thousands of rounds of ammunition in addition to the guns, but you described him on Friday as having a clean skin, nothing in his background that would have tipped authorities off.
THOMAS: Only a speeding ticket. This man could buy guns anywhere in America anytime, and officials say nothing could have been done to stop that.
STEPHANOPOULOS: But we are learning, as you say, a lot more about him. This was clearly – you described him as a mad scientist, a brilliant young man.
THOMAS: Brilliant. That's what made him so dangerous, officials say. One cop I talked to yesterday said, look, most criminals are stupid. This guy was thoughtful, brilliant, and we also have some new information about what they're finding at the apartment. We are being told by sources that they have found the computer, and also a poster of Batman.
STEPHANOPOULOS: He said I am the Joker. OK, Pierre Thomas, thanks very much.
Let's get more on this now with the mayor of Aurora, Steve Hogan, and Colorado Governor John Hickenlooper. Thank you both for joining us this morning. And Mayor, let me begin with you. We are just learning a little bit more about the investigation from Pierre Thomas right there. Do you have any other information about why this man might have done this?
STEVE HOGAN, MAYOR, AURORA, COLORADO: No, we don't have anything else right now. It's a very, very cold-blooded, calculated, isolated instance, and it's tragic, and it's horrible for those families, and it's hurt the community.
STEPHANOPOULOS: And we heard from your police chief real rage.
HOGAN: Absolutely. Aurora is a great place to be. It's been tough for our citizens. Our responders were, first responders were fantastic, but it's clear that apartment was set up to kill the first person who walked in the door, and more than likely, that was a police officer.
STEPHANOPOULOS: And Governor Hickenlooper, I heard you describe Mr. Holmes as a kind of terrorist. What did you mean by that?
GOV. JOHN HICKENLOOPER, COLORADO: I think that if you look, his intent maybe wasn't political, but what he was, was, I mean, clearly, deranged, twisted, demonic in some way, and he wanted to create fear, intense fear. He wanted to create terror.
STEPHANOPOULOS: In the minds of the people in that theater, and of course across the community. Mayor Hogan, how is the community coping with all this as the loss sinks in?