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8 May 2014, 15:14 | Updated: 8 May 2014, 17:03
Police are continuing to warn people in Cambridgeshire not to fall foul of the scam which has recently changed.
In the scam, the victim is called by someone claiming to be a police officer and told:
In the new development, the criminal claims the victim is at risk of being burgled and asks for details about high-value items.
They then advise the victim to call their bank using a number on the back of their bank card. The victim hangs up but the caller does not and the call is not terminated.
As a result and without realising it, the victim starts talking to the fraudster again, thinking they have called their bank.
Following a conversation, the offender says he will arrange a courier to collect the items.
Since Friday (May 2) there have been four attempts and two successful scams in Cambridge and South Cambridgeshire. One of the victims lost thousands of pounds worth of jewellery.
Detective Sergeant Emma Compson said: "This scam is hitting Cambridgeshire and a number of other counties across the country. The fraudsters are very persuasive and are now convincing the victims to get valuable items out of the house.
One victim didn't realise it was a scam until it was too late and is now scared to leave the house.
We are working closely with other police forces, banks, post offices and other partner agencies to raise awareness of the scam and remind people to be suspicious if they receive a phone call similar to this.
You should never give any bank cards, cash or valuables to anyone at your door, even if they say they are from your bank or the police."
To report an incident in action always call 999, if it is after the event call Action Fraud on 0300 1232040.