Two men have been injured - one seriously - in an early morning brawl at a home in Wanneroo in Perth's north.
Joondalup Detectives are investigating the incident, which happened at an address on Downing Crescent, close to Lake Joondalup.
Police said at about 2:30 on Saturday morning an fight broke out at the address with up to seven males involved.
During the incident, police said two men were injured, with one sustaining serious injuries to his chest.
A 48-year-old man was taken to Royal Perth Hospital by St John Ambulance for treatment to his chest wounds, while 49-year-old man with a minor injury was taken to Joondalup Health Campus.
Detectives are appealing for anyone with information or may have seen or heard the incident to call Crime Stoppers on 1800 333 000 or report on line to www.crimestoppers.wa.gov.au.