Five men burst into a home in Bedford before threatening an elderly woman, stealing cash and jewellery.
The men, who all had their faces covered, asked the 92-year-old woman to hand over her cash before searching the house.
They stole jewellery before making off in a silver BMW which was seen heading along Barnstaple Way.
The incident happened in the Devon Park estate at about 6.30pm on Thursday, November 20.
Detective Constable Jason Wheeler said: “This was a terrifying ordeal for the victim who was scared and confused.
“This was a despicable crime and the offenders need to be caught.
“I’m keen to speak to anyone who may have witnessed anything suspicious in the area or has any information as to who is responsible.”
Anyone with information relating to this incident can contact DC Jason Wheeler in confidence, at Bedfordshire Police on 101, or text information to 07786 200011.
Alternatively you can contact the independent crime fighting charity, Crimestoppers, anonymously, on 0800 555 111.