A cyclist was knocked off his bike after a car was deliberately driven into him.
He was then assaulted and had his wallet stolen, and detectives are appealing for information.
The incident happened at about 11.15pm on May 17, when a 35-year-old man was cycling home along Ribbleton Lane in Preston and rode past a car with a foreign number plate.
Police said a number of men who were standing next to the car verbally abused him, before the car was intentionally driven at the cyclist, knocking him off his bike.
The men then punched and kicked him and stole his wallet.
Members of the public intervened, preventing the cyclist from being more seriously injured, but the man did receive some treatment at Royal Preston Hospital.
The attackers are described as white and spoke with Eastern European accents.
The car used is described as being a small, possibly light blue, hatchback.
The incident happened at the junction of Ribbleton Avenue and Blackpool Road.
DC Danny Greene described the attack as “nasty” and urged witnesses to contact police.
He said: “This was a nasty and unprovoked assault and we are working to try and find the people responsible.
“If you witnessed this assault or have any information about the people responsible then please contact us quoting log reference LC-20140517-1926.”
Anybody with any information can contact Lancashire police on 101 or Crimestoppers anonymously on 0800 555 111 or online at Crimestoppers-uk.org.