Residents are being warned about phone call scams including people pretending to be police officers after two elderly victims lost more than £15,000.
Nottinghamshire Police say the scammers are using sophisticated "spoofed" telephone numbers which appear to be the police, helping to gain contact with their victims.
As part of the scams, a Hucknall man in his 80s handed more than £11,300 to the fraudsters, while another report from Newark saw an elderly lady lose £4,500 - both to a man pretending to be a Cambridgeshire Police officer.
The elderly male victim received a call on February 3 from the fraudster who said he was working for the Cambridgeshire force.
They requested him to withdraw £11,300 from his bank, and the victim co-operated with their request and later handed over the cash to a courier.
Just a day before, the Newark victim lost thousands after being told fake money had been transferred into her account.
The woman attended her bank and a courier later collected the package from her home address.
During both incidents, the fraudster used the same police officer's name and same phrasing, to convince both victims to hand over the money.
The Newark woman was also told it was part of a "secret investigation".
Detective Sergeant Anna Haynes, of Nottinghamshire Police, said: "If you receive such a call you should not give out any personal information and hang up immediately.
"If you are ever unsure whether the person speaking to you is a genuine police officer please contact Nottinghamshire Police on 101 and ask to speak with that officer, any police officer would not be offended by you wishing to verify their identity.
"We stress that no police officers will ever call you out of the blue asking for personal information, including bank account details.
"A police officer would never ask you to withdraw money or purchase high value items such as gold or watches as part of an investigation.
"We are urging people to share this amongst friends and family. Not everyone has access to the internet, so people do tell neighbours and relatives about these types of scams.
"If you receive a phone call like this please report it to the police immediately and inform Action Fraud."
