Thames Valley Police are appealing for witnesses following a racially aggravated assault in High Wycombe.
The incident occurred at around 3.20pm on Wednesday 1 December in Shelburne Road.
The offender had booked a taxi as his car had broken down.
When the taxi arrived the offender got angry with the driver, calling him derogatory names relating to his ethnic background.
When the victim asked the offender to get out of the taxi, he was held by the neck and shouted at by the offender who then got out of the taxi and left.
The offender is described as a white man, approximately 5ft 5ins tall of slim build, with short brown hair, clean shaven and squashed facial features.
He was wearing brown clothes, had a deep voice and his broken down car is described as a grey estate.
Investigating officer PC Cameron Parker-Graham, based at High Wycombe police station, said: “We are appealing for anyone who may have witnessed this incident, or any with information about what happened, to please come forward.
“To report any information to police, please call 101 or make a report online, quoting reference 43210543280.
“Alternatively, if you wish to remain anonymous, you can contact the independent charity Crimestoppers on 0800 555 111 or via their website.”