Residents have been urged to be vigilant after an elderly man was pushed over and had his mobile phone stolen during an attempted distraction burglary in East Winch on Saturday.
Police say three men called at the property in Town Close, between 4 and 4.30pm, claiming there was a problem with the water supply.
Although the resident, a man in his 70s, asked to see identification, the men refused.
They then knocked him to the ground and snatched his mobile phone after he had tried to push one of them away. He is not thought to have been hurt.
Rooms inside the house were also searched, though it is unclear whether any other property was stolen.
However, police are linking the incident with a similar one in Attleborough earlier in the day, in which around £100 in cash and bank cards was stolen.
A Volkswagen Bora car was seen near the scenes of both incidents and police say they need information about its movements.
Det Con Lee Hall. of Thetford CID, added: “I would urge anyone visited by cold callers to contact police immediately. We can quickly dispatch officers to the area and the sooner we are called, the better chance we have of detaining a suspect.”
Anyone with information is asked to contact Det Con Sarah Mitchell on 101.