2005 University of Oklahoma bombing
Probably not. That was during our "Safe" years under the Boosh regime.
Technology does exist to track folks by voice id, and in calling 911, the police want to locate where such a call comes from for the sake of the caller (someone being attacked).
That being said, it is almost 48 hours, and no arrests.
If the FBI is still a competent Government Agency, along with Homeland Security, they should know who the person is by now.
Of course, it might be typically dumb college student pulling a prank as a copycat, in which case, folks might be digging for a deeper motive than: "It is Monday, time to be stupid and get kicked out school"
Of course, if it is an Arab student and/or Muslim, waiting a little time might get a clearer picture of what is going on...
Whatever the case, I would bet if the Federal Government aids the Sheriff's Department, there should resolution to this within a month.
If Bush was still president, probably a week. If Obama, all bets are off.