Men posing as builders demanded money after entering a home in Perry yesterday (Thursday).
Cambridgeshire police said two men entered the home of an elderly victim without invitation in Glebe Road, at around 1.40pm, through an unlocked door.
The men claimed the victim owed them money for work they had undertaken at the property but he had not had work carried out and insisted they leave the home, located near Grafham Water.
One of the men was described as 41 to 60, around 5ft 8”, with greying, short hair and a ginger beard and the second was described as mid-30s, around 5ft 7” with short ginger hair.
Officers said that nothing was taken during the incident.
PCSO John Carter said: “These offenders have targeted a vulnerable victim in his own home but, thanks to the victim’s strong response, left empty handed.
“We would like to remind residents in the area to be vigilant and report any suspicious activity.
“If you have an elderly or vulnerable friend or relative it is worth making them aware of this type of offence.”
Anyone with information about the incident is asked to contact police on 101 quoting CF0501950917, or report online via www.contactcambspolice.uk/report.
In a second incident yesterday, a home in Main Road, Stonely, was burgled between 7.50am and 6pm while the occupants were at work.
Items were taken including jewellery, a camera and wrapped children’s gifts.
It is not yet known if the incidents are connected.
Anyone with information about this incident should contact police quoting crime number CF0528120917 or contact Crimestoppers, anonymously, on 0800 555 111.