A driver has been attacked with a metal bar in what appears to have been a road rage incident not far from Bradford city centre.
Witnesses to the alleged assault tried to intervene to help the victim, who suffered head injuries in the attack.
Police have only just revealed details of the incident, which happened on Manchester Road near its junction with Park Road, between 4.30pm and 4.40pm on Friday, May 31.
It happened when the victim had stopped his silver coloured Renault Megane behind a small blue coloured hatch back type vehicle.
He stayed in the Megane but a man got out of the hatchback and walked towards his car, opening the door and assaulting him with a metal bar causing head injuries.
When people came to help the hurt man, the second man got into the blue coloured car and left the scene.
A number of people witnessed the incident and officers want to speak to them about it. The suspect was believed to be Asian.
Anyone who can help should contact PC Derrick Pryce on 101.