A man was taken to hospital after an assault in the street.
The 29-year-old man was assaulted during reports of a disturbance in Marsh Street, Marshfields, Bradford.
The victim received a head injury and was taken to hospital for treatment.
Four Asian men are believed to have made away from the scene in a black vehicle.
Police were called just after noon on Wednesday. Inquiries are ongoing to establish the full circumstances.
Any witnesses to the incident, or anyone with information, is asked to call 101, or Crimestoppers in confidence, on 0800 555111.