A 24-year-old Mandurah man was stabbed after a fight broke out at a taxi rank in Fremantle in the early hours of Sunday morning.
Police said a fight had escalated between several people on Henderson Street when the stabbing took place at 4.20am.
The altercation resulted in the man being taken to Fremantle Hospital for treatment for a minor stab wound, police media spokeswoman Susan Usher said.
She said a 26-year-old Yangebup man was assisting police with their inquiries.
Anyone who was in the area at the time who may have any information on this incident, is asked to call Crime Stoppers on 1800 333 000.