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All you people complaining about two hours being so long: this is real life, not 24. It wasn't Jack Bauer responding who instantly knew what was going on, had computer whizzes at his instant command to pull up reems of data about the perpetrator, and then could task satellites to track him down. This was regular, every day cops who walked into a room with bloody bodies and had no other information.
I don't know anything about police procedures, but let me take a stab at a timeline (if anyone has any real knowledge, please weigh in).
7:15: shooting occurs
7:30: first police officers arrrive
7:40: responding officers realize this is a murder scence and call the detectives and their superiors. Universitity leaders informed that a murder has happened but have no other info.
8:10: the detectives and superiors arrive and start gathering info
8:45: after talking to witnesses, examining bodies, etc, police have a preliminary picture of what happened and inform university leaders. Only now do university leaders have any concrete information on which to act.
9:00: University leaders discuss what measures to take. Within minutes, measures are being taken.
I don't claim that everyone involved acted with perfect competence. However, my guess is that all you finger pointing people might occasionally make mistakes. So far, not one bit of information has emerged that suggests that the decisions made were not at least reasonable given the information available at the time.