A 64-year-old man had his car stolen after being threatened by two men who demanded his keys.
The victim was approached by the men in Valley, Road, Northampton at about 4pm on Friday, November 9 and handed over the keys to a blue Mercedes Benz, which the offenders made off in.
The first offender was white, aged in his late 20s and of slim build.
The second offender was of mixed race, in his lates 20s or early 30s, around 5ft 11ins, well built and wore light blue jeans.
Witnesses can call police on 101 or Crimestoppers, anonymously, on 0800 555111.