A rogue roofing company operating in Bedford has conned at least two people out of money in recent weeks.
Police are urging elderly and vulnerable people, their families and friends to be on their guard following the incidents.
Neighbourhood Watch county support officer Lynne Arch said: “This trader uses a white van with a roof rack for ladders and is handing out flyers to residents claiming their roof tiles need fixing urgently.
“If a vulnerable family member or neighbour is cold called by such a company you should ensure they do not agree to any work and contact your local Trading Standards officers.”
Anyone with information about the rogue traders can contact Beds Police on 101, or text information to 07786 200011.
Alternatively contact Trading Standards at Bedford Borough Council on 01234 718527 or the Citizens Advice consumer helpline on 03454 04 05 06.