This is just horribly tragic and my thoughts go to all who have been affected, both directly and indirectly. This is an event that is extremely hard to deal with and the victims need loving thoughts. I don't know anyone who is at that university, but my thoughts go to all the students, faculty, staff, and their family members.
As for what the school could do, well, I work in an extremely large university (one of the largest in population 48,000+) and this terrible event has brought many questions. What does a university do? How do they handle it? When is it bad enough to close/lockdown the school? Are we prepared for such an event? I know we are mostly prepared for natural disasters (hurricanes mostly) but I don't think we consider the worst of scenarios. It's in the COOP plan, but rarely practiced, which is needed for preparation. That,Im sure will change.
Again, I can not express how I feel, the sadness within me. We must heal this nation's and this world's soul to end such tragedy.