(Beaverton, OR)  --  Beaverton police say they're investigating more than 30 separate incidents in which vehicles were vandalized by gunfire.  Authorities say windows were shattered or shot out by bullets sometime after 10 p.m. Saturday, and all the shootings appear to be random.  The neighborhoods affected were both in the southwestern area of the city.  Anyone with information helpful to the investigation is asked to call 503-629-0111.