UPDATED: The police officer central to the fatal shooting of a man in Beechboro last week has been stood down from duty as Homicide Squad investigates.
A WA Police statement confirmed on Thursday the officer had been stood down, pending the results of the investigation.
"The investigation is ongoing and WA Police Force will not be making further comment at this
time," the statement read.
Reports in the wake of the man's death on Thursday last week suggested he may have been holding a knife when he was shot.
The man's sister spoke to reporters at the scene on the night, shortly after officers responded to a family violence incident at a home on Yenisey Crescent about 4.30pm.
Oanh Tong told Nine News she heard her brother was shot twice because he was holding a knife when police arrived at the family home.
"I heard the police say my brother hold a knife, because my brother (was) frightened," she said.
"It's not a sharp knife, and they shot him. His body (is) at the door.
"I'm not ready for this."
It is understood police were called to the residence following an argument between the victim, Ly Tong, 38, and his father. Three generations of family live at the home.
In a brief statement released last week, police said the incident would be investigated by Homicide Squad, "as per normal practices".
"This investigation will be overseen by the Internal Affairs Unit," the statement read.
Nine News Perth reporter Renae Henry was at the scene, and described the response in the wake of the shooting.
"We understand that there was a siege-like situation at this residence ... for several hours," she said.
"It may have started out as a domestic [incident], it has been resolved ... but sadly it has ended in a man being shot.
"We saw people we believe to be family of the deceased man arrive here. One man was yelling at police: 'just because you have a gun, you think you can shoot anyone.'"