MIAMI BEACH, Fla. -- Authorities say the brother of socialite Paris Hilton was assaulted at a Miami Beach party.

A police report says 24-year-old Barron Hilton told authorities a man struck him in the face after the two had an argument at a party Friday in a Miami Beach home. Hilton suffered deep cuts on his forehead and nose. He posted of photo of the injuries online.

Neither Hilton nor two witnesses could identify the suspect. According to the report, witnesses told police that the suspect wanted Hilton to leave and hit him in the face with an unknown object. The suspect then fled in a dark green SUV.

The report says Hilton refused treatment from fire rescue workers.