It has been traditional in the Arab world to fire off guns into the air at weddings and indeed all outdoor celebrations ever since there have been guns in that part of the World. That doesn't mean it's a wise thing to do when you're in a war zone with nervous American soldiers flying around in helicopters, of course, but it's still going to happen. Occupying armies frequently shoot at the wrong people. It's generally hazardous to occupy foreign lands...both for the occupying forces and for the locals. That's one of the reasons I generally argue against invading people...specially when it's done on an extremely flimsly or a totally false pretext, as it was in the case of this war on Iraq.