Three men armed with knives broke into a house and demanded money from a Rushall woman on Sunday.
It happened just before 11pm at a property in Air Station Lane.
Police believe the offenders broke into the property all holding straight bladed knives and demanded money from the occupant.
Nothing was stolen and no one was injured.
The offenders are described as being black, of slight build and all wearing shiny black hooded tops and trousers.
Enquiries are ongoing, and a spokesperson for the police they believe it is an “isolated incident”.
Anyone with information or witnesses should contact DC Simon Cooper at Thetford CID on 101 or call Crimestoppers anonymously on 0800 555 111.”