Then the thing to do is report the incident to both agencies (the bus company and local law enforcement). In both cases, request a reply as to what is being / will be done. Request to be notified if either agency has contacted / will contact the other about the incident (they're usually both agencies of the same municipal govt, after all). Your response from both may be "neither of us are doing jack about it", but at least it then becomes a matter of public record.