Frankly, I don't think you or I KNOW why the FBI is in there. We DO know that they have a very nice ballistics lab.
Put it this way: if you were GWB and KNEW that this was the "T" word, would you: 1) alarm the whole Republic and every citizen therein with a broadcast of the "T" word (knowing full well as observed on this thread that there's damned little ANYONE can do to defend against these creeps) or: 2) get FBI, CIA, Secret Service, BATF, and every other alphabet agency including EEOC busy on the "T" possibility while KEEPING YOUR MOUTH SHUT???
Methinks GWB has told them to look hard at the Muslims and be quiet about it.