A friend of mine works in a large airport. All of the airport employees were forced to empty their lockers, and clear the contents through airport security. My friend had a large, and very sharp steak knife in the locker. Put the knife and other items on the x-ray belt, and was handed back the steak knife after passing security. Back into the locker it went.
All of this sudden panic makes me think they are looking for something big at any moment that they know is coming down the pike...they just are throwing darts at anything.