A man who was lured back to a flat by a woman ended up having a knife held to his throat as he was searched for cash.
Detectives have released a CCTV image of a suspect following the robbery in a flat on Lychgate, in Preston city centre.
The victim was a 23-year-old Preston man who works as a cash collector for food businesses across the north west.
It is understood he had hundreds of pounds of takings on him at the time of the robbery.
He went back to a house with a woman at around 10.40pm on February 15, police say, when two men appeared.
One held a brown handled knife to his throat while the other searched his clothing and stole money from him.
Both men are being hunted by police.
Officers are hoping members of the public may recognise the man in the image, who walks with a distinctive limp and had a light coloured jacket.
He was caught on camera at a nearby property.
DC Abid Majid, of Preston CID, said: “Whilst the image does not show his face, we are hoping a member of public may recognise his clothing.
“The victim is unhurt but very shaken.
Officers are currently quizzing a 32-year-old woman on suspicion of robbery.
The man in the image is described as white, aged around 35, 6ft tall and with short fair hair. He was wearing a beige jacket.
Anyone with information is asked to call Preston Police on 101 or Crimestoppers on 0800 555111.