CNN Anderson Cooper 360 September 18, 2013 00:15:00
Everything they see, everything they find is a data point they put into a computer program. they are re-assembleing a model of what they think what happened. early in the morning in the 8:00 hour as we've talked about, the shooter drove up, showed his i.d. walked inside, was carrying a bag. video under surveillance shows him going into a bathroom on the 4th floor. he emerges with a shotgun at the ready. >> it seems like he assembled it. >> you can do it in a minute of ten second, a recommendington, comes out very early on. they believe he had an encounter with the security guard and took his 9...
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