A man and woman were threatened in their own home after two men broke in during the early hours.
The intruders broke into the house in Hall Park Lane, Rushden, just after midnight on Saturday, July 26, and made their way to a bedroom, where they threatened the 63-year-old man and 35-year-old woman, demanding money.
The male victim was assaulted and sustained a broken arm during the incident, which also saw the woman forced into the kitchen and they demanded she hand over cash.
There was no cash in the house so the offenders stole a wallet and fled the property.
The thieves were both about 5ft 9in, of slim build and wore dark coloured clothing, with their faces covered and hoods up.
They possibly spoke with Asian accents.
Police would like to speak to anyone who may have information about the incident or who may have seen two men in the Hall Park Lane area of Rushden acting suspiciously in the early hours of Saturday.
Witnesses or anyone with information can call police on 101 or Crimestoppers anonymously on 0800 555111.