He was hunting. You can hunt with guns here, so the America + Gun thing doesn't really add up.
It's not like this happens often either, so I don't think arguing that it wouldn't happen here holds too much water either; this time last week, it was just as unbelievable you'd hear about it happening there.
I'm saying no more on the matter, I don't want an American-bashing debate, this isn't the time and place, I just get a bit bored of the stereotyping (especially when it doesn't make sense)