First off, the shrill alarm sound freaked me out, but second, I realized I'm 27 floors from the ground. This was not a drill, so I was a little anxious about the situation. Apparently you are supposed to walk down 5 floors and stop. We do not go to the ground floor. An announcement said there was a situation on floor 27. My floor!
10 minutes later we went back up. There is construction on my floor (I sit right next to the door leading to it) and something related to that set off the alarm.
Exciting afternoon!
-- Mobile dispatch (apologies for brevity or spelling mistakes)