Complete hearsay, so take this with a grain of salt...
My wife's coworker just called. Her (co-worker's) brother is a loan officer at a bank. His co-worker has an aunt that works for the CIA. The aunt called him today and stated that she couldn't go into details, but that she would strongly advise him to go to the grocery and stock up on as much non-perishable food and other necessities as possible.