Police were called to a home on Strathmore Place in Glen Alpine about 12:25pm on Thursday following reports a man was making threats. Officers arrived to find a 21-year-old man allegedly armed with a pistol.
Assistant Commissioner Stacey Maloney said the man was the partner of a woman whose family lived at the address, and there had been no previous domestic violence incidents or apprehended violence orders. The woman was taken to hospital "in a state of shock", Maloney said.
"There were police cars out the front so he would have had some idea that police were in attendance, so ultimately, the police were quite brave in confronting this individual," Maloney said.
A confrontation ensued during which the man was shot once in the stomach. Officers immediately provided first aid before paramedics took over. The man was taken to hospital in a serious condition. No other injuries were reported.
Police tape surrounded the home on Thursday afternoon, where discarded pyjamas and a pair of slippers were seen on the front lawn. Personal items were also strewn across the property as officers led two men away in an unmarked police car.
Maloney said the officers involved had responded appropriately in line with their training and are being provided welfare support.
A critical incident has been declared, which is standard procedure for police shootings. A crime scene has been established and the Critical Incident Team from Burwood Police Area Command will investigate, with oversight from the Professional Standards Command and the Law Enforcement Conduct Commission.