A man and a woman have been charged following a deadly siege at a signage business in a southwest Sydney industrial estate.
The stand-off on Monday ended with the 33-year-old gunman taking his own life, six hours after tactical response officers swarmed Ingleburn business Inline on Monday just before 11am when three brothers were shot, one fatally.
A 52-year-old man and a 30-year-old woman were charged overnight, police said on Tuesday.
The gunman, who was thought to be armed with an assault rifle, held hostages in the factory unit as negotiators tried to get him to surrender.
Three hostages were released just after 5pm before officers found the gunman's body, named by media as 33-year-old Finks bikie gang associate Wayne Williams.
It's believed he fatally shot 43-year-old Michael "Mick" Bassal and injured his two brothers, aged 41 and 34, who were taken to Liverpool Hospital.
The older brother is in a serious but stable condition and the younger brother has minor injuries, police said.
During the first few hours of Monday's siege, a 30-year-old woman and a 52-year-old man were led from the building by police.
The man was later charged with discharge firearm in a public place and conceal serious indictable offence.
He has been refused bail to appear at Campbelltown Local Court on Tuesday.
The woman was charged with conceal serious indictable offence. She's has been granted strict conditional bail and is due to appear in the same court next month.
Nearby local businesses and surrounding streets were sent in lockdown during the six-hour siege, with police telling people not to go near windows.
Three male hostages were released from the factory building in Heald Street just after 5pm and officers then found the gunman's body.
"(Police) located three persons, factory workers, hiding in that unit," Acting Commander Mark Brett said.
"A further search of that unit located a male deceased.
"It's believed that person died from a self-inflicted gunshot wound."
He would not say when the man died, and said it was now a matter for the homicide squad, though it's understood he may have died several hours before police entered the building.
* Readers seeking support and information about suicide prevention can contact Lifeline on 13 11 14 or MensLine Australia 1300 78 99 78
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