Officers are urging people in Calderdale to watch out for scammers pretending to be from West Yorkshire Police or West Yorkshire Police authority.
Police have recently received reports of people pretending to be from either the force, the police authority or a similar organisation, claiming they are producing a leaflet.
They claim the leaflet is about different crime problems and ask the person if they want to advertise on it. They usually request £95.
The police authority no longer exists, having been replaced by the office of the Police and Crime Commissioner, and West Yorkshire Police says it does not canvas for advertising in this way.
Police say another possible scam operating in area is a telephone caller saying they are from a payment protection insurance claim back company and that they need a sum of money via ukash vouchers in order to process the refund.
A spokesman for West Yorkshire Police urged residents to be vigilant.
“I would always urge people to be aware of callers either at the door or on the phone who are not invited. Take steps to verify the company before parting with any money.”
West Yorkshire Police and Crime Commissioner Mark Burns-Williamson said: “I am always concerned to hear about people trying to obtain money through scams, but more so on this occasion when the offenders are trying to pass themselves off as being from the police or the former Police Authority. I would urge everyone to be alert to the possibility that cold callers may not be genuine and to report any suspicious instances to the police.”