Bogus calls were made to three people in Leamington from a man pretending to be a police officer from Scotland Yard.
On each occasion, he told the victim that their bank card was being used by criminals in Birmingham. He asked the victims to call 999 in order to verify his identity, but remained on the line.
In previous instances the scammers have asked the victims to call the bank, but remained on the line in order to convince them to hand over bank details.
Fortunately in each of yesterday’s incidents, no one handed over any personal details.
Warwickshire Police is urging people to be vigilant to the scam, which is often targeted at elderly people.
Det Chief InspSean Paley said: “We are continually urging people to be vigilant to the scam. Please remember police officers, and banks will never ask for account details or PINs over the phone. They also would not come around to your house to collect your cards or property.
“We would encourage anyone with elderly relatives or friends to talk to them about this scam, and make sure that they are aware.
“If you receive a call like this, hang up immediately and call police on 101 using another phone. If it’s an emergency please call 999.”