In reply to john arran:
I was climbing at City of Rocks in Idaho and there were a couple of American guys climbing a route on the same buttress. They were close enough that we could hold a shouted conversation.
When we were almost at the top of the route (I think it was three pitches), a pick-up truck pulled up on the road below and a guy got out, produced a rifle from the back and started shooting at the other climbers. Apparently they'd had a fight in a bar the night before and it seemed like the shooter was out looking for them. It was pretty scary being up there with bullets whizzing around, but the Americans were just shouting a load of abuse down at him.
We got out of there as quickly as we could.
I also climbed at Shelf Road on that trip, but didn't get shot at. There was plenty of shooting at Fremont Canyon, but it was mostly drunk people firing into the air. It wasn't the quietest camp site I've ever been to.