(EDIT - sorry misread what you said... i blame the late night and congested head)
last time i called was for something similar, they put me through to the closest police station and the cop on the other end told me not to bother as they wouldnt be able to get anyone out there to pick them up... so i went home and left them to cause whatever havoc they did.
i see it all the time thanks to starting late nights some times and coming home at early hours of the morning... i dont bother trying to call the cops anymore cause its a waste of time.