When a University of Memphis football player was found fatally shot on campus, resident assistants banged on doors warning students to stay in their dorm rooms.
When a man wearing a Fred Flintstone mask and toting a .50-caliber rifle was arrested at St. John’s University in Queens, N.Y., students were alerted by text message 10 minutes later.
And when a deranged man called the University of Wisconsin-Madison and said he was on campus with a gun, administrators sent e-mails and put the word out on the Facebook website.