Police said that the suspects approached the victim as he exited his vehicle just after midnight in the 200 block of Armour Avenue.
The victim told police that the suspects assaulted him and took property out of his pockets when he refused to make change for a counterfeit bill. The suspects then fled south on Airport Boulevard in a black four-door import sedan with tinted windows, police said.
The suspects were all described as Hispanic men about 20 to 22 years old wearing black clothing and baseball caps with “SF” logos, police said.
South San Francisco police are asking anyone with information on the case to call (650) 877-8900 or an tip line at (650) 952-2244.