A man was left with cuts to his shins and bruising to his face after he was dragged from his car in Mulberry Close, Luton, on Tuesday.
The incident happened at approximately 1.30am when the 24-year-old victim was pulled from his car by the occupants of a silver VW Golf and a black Vectra.
The offenders, who are all described as being of Asian appearance, left the victim with cuts to his shins and bruising to his face.
Detective Sergeant Katherine Rivers, investigating, is keen to trace witnesses to the incident.
DS Rivers said: “I would appeal to members of the public who have any information which may help piece together exactly why this assault happened.
“I would urge anyone who saw or heard anything suspicious in the area during the early hours of Tuesday morning to contact officers.”
Anyone with information about this incident can contact DS Rivers, in confidence, at Luton Police Station, on 01582 394009, or 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.