Thames Valley Police and banking institutions have asked retailers to be aware of the latest scam targeting the elderly and vulnerable.
The force said it has seen an increase in elderly and vulnerable people withdrawing large amounts of cash in bank branches, or at cash points, and being asked to purchase gift cards to pass on to scammers.
It has asked retailers that if they feel something is not right, and someone is making an unusual purchase, to challenge them as they have the right to refuse the sale.
Thames Valley Police has also asked retailers to call 999 if they feel someone nearby may be coercing the customer.
If you have elderly or vulnerable friends and relatives, please make them aware of scammers asking them to withdraw money and buy gift cards to pass on to them, and to be vigilant of any signs of coercion.