Police in Sherwood are warning people to be on their guard against a new scam.
There have been reports of fraudulent callers claiming to be from the police asking people to hand over money, bank details and items.
A post on the Sherwood Police Facebook page says: "A real police officer will never ask for your bank details or PIN number.
"Police officers would never come to your house to collect your cards or property and would also never ask you to transfer money to a secure account.
"If you receive a phone call from someone who you believe is not genuine, and you suspect a scam is taking place or you feel vulnerable, hang up, wait five minutes to clear the line, or where possible use a different telephone line, to call police on 101 or Action Fraud on 0300 123 2040 to report the incident.
"If you have elderly friends or relatives who may be vulnerable to such a scam please talk to them and make them aware.
"If someone comes to your door claiming to be a police officer, always ask to see their identification. Close the door and if you are in any doubt or have any concerns call our control room on 101 and ask to be put through to an officer to check they are genuine. A real police officer will not mind waiting while you check.
"We'd also appeal to people to look after their elderly neighbours, friends and family. Remind them to be vigilant and make them aware of these sort of scams."