That's what I saw at DIA yesterday!!!
I arrived at DEN early from Laramie and saw MANY police cars going down the taxi-ways. When we were on approach I saw what looked like an F-15. I saw a United Airbus parked in the parking area (was not at the gate), but I figured it was parked for maintenance.
Wow. Can't believe I was in the air by DEN when this all happened.