I went to the range there once, but that was enough. Very unfriendly folks there, and some of the policies are ridiculous.
I'm guessing the fire was simply unburned powder on the floor, but I never saw anything official. I did post some pics of the fire since I was there doing a trade when it was happening.
It definitely just involved the range, but I have no idea how much damage there was. I'm pretty sure they are open now, so it couldn't have been that bad.