Thieves posing as police officers are targeting the elderly and vulnerable in South Holland.
Lincolnshire Police has received reports of the incidents in and around Spalding over the last 24 hours.
The force is urging the public to be vigilant.
Inspector Gareth Boxall, said: “Yesterday we received another report of a Police Impersonation Fraud in South Holland. This is the latest of a number of reports that we have had in Lincolnshire in the past few months targeting elderly and vulnerable members of the public.
“The latest offence involved an elderly victim being contact by someone claiming to be a police officer who instructed them to withdraw a large amount of cash which was later collected. We are investigating this offence but sadly this victim has been deceived out of a considerable amount of money.
“My plea to anyone reading this is to pass the clear message that No police officer or law enforcement agency will ever ask members of the public to handover money. We have seen previous attempts made by those pretending to be from the National Crime Agency (NCA). NCA officers will not ask members of the public to do this either.
“If you are contacted by someone claiming to be a Police Officer or any other law enforcement officer (such as the National Crime Agency) who is asking you to buy goods or hand over cash, please call us on 101 and report to Action Fraud on 0300 1232040. If a crime is in progress please call 999.”
