Most recent threat occurred literally as I was writing this: http://www.pittsburghlive.com/x/pittsburghtrib/news/breaking/s_789612.html
I'm going to use some intelligence analysis techniques and provide some key findings and actionable plans for decision makers.
Disclaimer: I am in no way affiliated with the University of Pittsburgh. The FBI and campus police are already engaged in an intense investigation. I am merely an intelligence analyst who wants to take a shot at figuring this out. All views and opinion are strictly my own.