Scammers have been calling residents in a Sheffield suburb asking for cash for computer software repairs.
South Yorkshire Police said reports have been received from residents in Handsworth who have been contacted by people claiming to represent computer software companies and asking for payment for repairs and upgrades.
The force is urging people against giving away personal and financial details to strangers over the phone.
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Inspector Jason Booth said: "We have been informed by residents in the Handsworth area about what appears to be a phone scam - random calls, possibly from overseas call centre, to residents stating they are representing software companies needing to update or repair computers. Of course a payment is required.
"My advice is to never give personal information and certainly not bank details to any cold callers by phone or in person.
"Genuine companies should never mind you refusing and generally banks will never ask you to divulge passwords either on the phone or via email.
"Always treat cold callers with caution. Always ask for ID from officials, including plain clothes officers. Genuine officials don't mind you checking they are legitimate.
"I would also treat with care emails asking you to log in via a link on the email. You could be logging into a spoof site gaining your log in details and passwords. If in doubt, please check."