A gang of burglars armed with knives burst into a Corby house and threatened the people living there.
The three men burst into the home in Wilby Close on the Lodge Park estate at about 1pm yesterday.
Once inside the property, they punched one man and threatened a woman with a knife.
The gang demanded valuables, but eventually left empty handed.
Two of the men were white. The first was in his late 20s to early 30s, had short, light brown hair and stubble and was about 5ft 11in and stocky. He was wearing a black jacket and grey tracksuit bottoms.
The second white man was in his 20s and was tall and skinny. He was wearing a white Adidas jacket with the hood up.
The third man was black, about 5ft 6in and muscular. He was in his mid-20s, had short curly black hair and was wearing black clothing.
Witnesses or anyone with information can call Northamptonshire police on 101 or Crimestoppers anonymously on 0800 555 111.