Two men threatened householders to be let into their home in an attempted burglary.
The incident happened at about 10.20pm on Saturday in The Street, Pulham St Mary.
The householders, who were upstairs, heard loud banging on the door and went to investigate.
The suspects, believed to be two men, also smashed a glass pane in the door.
They left the scene in a car along Hall Lane after failing to get in.
It is believed the car was driven on fields coming out onto Hardwick Road, near to the junction with Wood Lane.
Police would like to hear from anyone who may have witnessed the incident or noticed a vehicle being driven in a suspicious manner in the area.
Witnesses should contact Det Con Lee Hall at Thetford CID on 101 or call Crimestoppers anonymously on 0800 555 111.