fire alarm

A Fire Alarm is Going Off At Downtown Boise Post Office off 13th
I ran in to the Post Office in downtown Boise on 13th and Shoreline drive near the Boise River. I parked on the side and walked up and went in, there was no alarm going off when I first entered. I walked up near the front to where the package drop off was and pulled down on the handle. Full, it was full and not opening and of course the main lobby is closed and blocked off because it is Columbus Day. As I gave a slightly frustrated grump and started to turn back to the door with my packages, the fire alarm started going off.