No it was Montreal Police on their channel 3. 16 is in Verdun & 20 is downtown. It was going on all night, it was not 1 operation. I also heard cars from station 12 (Westmont) being called with the D.Might be RCMP. That is how they number their vehicles. If you were listening to QPP or Montreal Police, maybe they were working with the RCMP on a common frequency?
D for "Days". Probably not.What confuses me is that now at 20h00 they are using the "-" again.