A 29-year-old First Nations man has been shot dead by police in the Brisbane suburb of Grange.
Emergency services were called to an address on Days Road just before 2:30pm on Sunday after reports of a domestic violence-related incident.
Police said early investigations indicated a father had been stabbed by his son.
The 29-year-old man was then fatally shot by police.
Residents said they heard multiple gunshots and a heavy police presence could be seen at the property.
Detective Superintendent Andrew Massingham said police arrived at the scene to discover a 53-year-old man with a laceration to his left hand and a shoulder injury.
He said the person believed to be responsible for causing the injuries was still at the property, and the two officers first on the scene called for backup.
"A short time later that man lunged at police with what we believe is a knife, which resulted in a uniformed constable from a local station discharging three shots into that person," he said.
"CPR was commenced immediately but that man, who is a First Nations man, died tragically at the scene some minutes later.
"This is indeed a tragic afternoon for the family who were present and witnessed this incident, it's a tragedy for our first responders as well."
Detective Superintendent Massingham said police and paramedics were called to the same address a day earlier due to concerns over the man's mental health.
"The nature of the activities involved with treating him yesterday is now subject to … investigation," he said.
Detective Superintendent Massingham said it was understood a taser was not used at any time during the incident.
He said the officers involved had not yet been interviewed by investigators.
"Also, some police body-warn video which has captured this incident is yet to be viewed," he said.
Detective Superintendent Massingham said the other man involved was being treated in hospital for non-life-threatening injuries.
He said it was an "emotional and confronting" scene and officers are still trying to speak to witnesses.
"There was a large number of family present, including close relations of the deceased," he said.
Tegan Sprenger, who lives in a nearby street, said the incident was "unnerving".
"This is the third death in the area in a year. It really feels like there is heightened crime," she said.
"I have added security cameras to my home so I can feel safe."
The Ethical Standards Command is investigating the incident on behalf of the coroner, overseen by the Crime and Corruption Commission.
