http://slog.thestranger.com/slog/archives/2011/06/28/ar-15-left-sitting-on-trunk-of-seattle-police-car 

"Slog tipper Nick says he spotted this SPD car parked in front of the Roosevelt Hotel on Pine in downtown Seattle last night just after 9 PM. There were no cops in the car, says Nick, no cops on the sidewalk, no cops anywhere. Just a cop car with an assault weapon sitting on the trunk.

"Flagged down bike officers," says Nick, "they were shocked as hell."

Um... good thing it was a Slog tipper—good citizens, all—who happened by and not, you know, a sociopath or an anarchist or a gun collector."