Detectives are investigating a string of bank card frauds by bogus police and bank staff in Leeds.
Con men have been involved in at least ten so-called “courier fraud” offences in the city and Wakefield.
The scam involves victims receiving a telephone call from someone claiming to work either for the police or a bank regarding alleged fraudulent activity or problems with their account.
Detective Constable Mick Wilson, of the economic crime unit, said: “The caller will generally then ask a series of security questions, including asking for the PIN number, and then advise that someone will attend shortly to collect the card.
“A taxi driver or courier will then call at the victim’s address and collect the card.”
He added: “The police, banks and building societies do not operate in this way and you should not disclose your PIN number to anyone regardless of who they claim to work for.
“You should also never hand your bank card over in this way.”
Anyone who thinks they have been a victim of such an offence should call police on 101.