A pensioner was left with a broken wrist after she was pushed to the floor in a violent robbery in her own home.
The 69-year-old victim was injured in the robbery, which happened in Kingsland Avenue, on Friday, at around 10.30pm.
The woman and her husband were at home, Northamptonshire Police have said, when the doorbell rang.
After she answered the door, the robber pushed the woman into the house and told her to stay down, shoving her to the floor and causing her to break her wrist.
The woman’s husband managed to fight off the robber, forcing him to flee the house without taking anything.
The man was white, 6ft and with short jet black hair. Police say he was in his 30s, with a round chubby face, of stocky build and spoke with an Irish accent.
He wore a dark-coloured jumper and blue jeans and was possibly wearing a high visibility jacket or vest.
A police spokesman said: “This incident is not believed to be linked to any other similar incidents and people are being advised to not open the front door unless they are expecting a visitor.
“If you do have a knock at the door and are not expecting anyone, always ask for ID and do if you have any concerns, don’t answer the door.”