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Fraudsters pretending to be police officers have been targetting residents with one victim handing over more than £5,000.
Residents across north Kent have now been warned of the gang after 11 homes reported receiving phone calls from people claiming to be working for the police.
Investigations are now under way following the calls received by residents in Dartford, Higham, Longfield, Rochester and Gillingham since the start of the month.
One victim gave £5,000 to the con artists after it was arranged for a courier to collect cash after telling them their bank card had been used fraudulently.
Kent Police has now issued a warning and advice to people about how to remain vigilant.
The criminals claimed to be a detective based in London who had told them there was an issue with their bank account.
Det Sgt Marc Cananur, from Kent Police’s Serious Economic Crime Unit, said: "A police officer will never ask a member of the public to hand over money, nor will they request banking details or a person’s national insurance number.
"In most of these incidents, no money or personal details were exchanged but I would urge members of the public to wary of this type of scam.
"Fraudsters can go to great lengths to appear genuine and often target the elderly or people who they think are vulnerable.
"We are reviewing the incidents and take offending like this extremely seriously.
"At the same time, there are a number of precautions you can take which can reduce your chances of falling victim to this type of offence. I would encourage everyone to take heed of the following advice and share it with friends and family."
Police have given six pieces of advice to help keep people safe from scammers:
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