Bogus gardeners have been targeting the homes of elderly residents in parts of Sheffield.
Officers from Sheffield South East neighbourhood police team said conmen had been knocking on doors in the area this week.
In a statement, the team said: “Please do not pay for work before it’s completed and always go with a reputable company. If you’re not sure about anyone calling at your house for work, call us.”
The officers also advised people to ask for ID of workers.
Anyone with any information should call police on 101 or Crimestoppers, anonymously, on 0800 555111.