I wonder . . . . .

Just listening to MSNBC doing an interview with the gal who lived downstairs of the creep. She said that at exactly 12 midnight, there was a burst of very load music coming from her upstairs neighbor's apartment. This was unusual, as they rarely heard any sound from up there. She went upstairs and knocked on the door. It was closed, but she had a sense it was unlocked.

She went back to her place and didn't know anything else until the police made everyone leave several hours later. IF she had opened the door, that would probably have set off an explosion. Then all the focus of police and fire and rescue would have been at that building. But there was no explosion, so there was immediate response at the theater.

Remember the guy in Norway? He set off some explosions in Oslo, and while everyone was focused on those, he was off on that island having free rein to shoot all the campers.