Robbers posing as customers punched a taxi driver and stole his takings.
The driver picked up two men from a pub in Bell Dean Road at about 1.40am on Saturday.
He took them to a block of flats off Saffron Drive, Allerton.
There, one of the men then punched the driver while the other stole his takings of around £150.
The men, who were white and believed to be in their early 20s, ran off towards Saffron Drive.
One of the men was of average to medium build and about 5ft 10ins tall. He had a round face, big eyes and a pointed nose and was wearing a dark woolly hat, a blue hooded top and grey bottoms.
The other was skinny and about 6ft tall. He was wearing a red hooded top, which also covered his face.
Both men spoke with local accents.
Anyone with information is asked to contact Detective Constable Jazz Gill at Bradford CID on 101.