Police are urging the public to be extra vigilant after reports of bogus workmen operating in Glenrothes.
A number of elderly and vulnerable victims have been targeted by criminals, who offer to carry out roofing or gardening work as reputable companies.
Police say several methods are being used. This includes asking for change of a high-value note, then not having over the note; asking people to pay for work before it has been carried out; and asking for a glass of water then rummaging through their bedrooms, stealing money and valuables.
Inspector Kirk Donnelly, who in charge of local policing in Glenrothes, said: "This type of crime is despicable and targets our most vulnerable members of our community. Let’s work together to stop them.
"I would ask anyone with an elderly or vulnerable family member to contact them and take the time to explain safety measures which can been taken to prevent them becoming a victim.
"Don’t allow anyone into your home if you feel unsure in any way. Do not be afraid to say no and close your door. Have a nominated family member you can contact before agreeing for any work to be carried out or handing over cash.
"I would also like to remind people that local community officers are on hand who can offer advice and guidance for those who may benefit. Your local community officer can be contacted via 101.
"We are currently investigating reports of bogus callers in Glenrothes and are following a positive line of inquiry. I would appeal to members of the public for their help, if you see anyone in your area or community you think may be suspicious then please contact us immediately."
Anyone with any information is asked to call Police Scotland via 101 or call Crimestoppers on 0800 555 111.