A fourth person has been charged over a brawl at a public housing estate in Sydney's west.
The brawl involving up to 100 people broke out in Macbeth Way, Rosemeadow, south of Campbelltown, just before midnight (AEDT) on Monday.
A 26-year-old man from Rosemeadow, was arrested at Campbelltown police station on Wednesday evening and charged with affray.
He was refused bail and is likely to appear in Campbelltown court on Thursday morning, a police spokesman said.
Two 16-year-olds who were stabbed multiple times in the brawl are in police custody and will face Campbelltown Children's Court on Thursday.
One was charged on Wednesday with multiple offences over the shooting of two men aged 20 and 29 - one of whom was shot in the back and one in the buttocks.
Anthony Michael Neely, 18, who was not injured in the brawl, was arrested at the scene and charged with affray on Tuesday.
He was granted conditional bail in Campbelltown Local Court on Wednesday by Magistrate Michelle Goodwin.
The neighbourhoods are under police surveillance in Sydney's south-west to prevent a recurrence of the conflict that left men and youths as young as 16 with stab and gunshot wounds.
Local police, along with the riot squad, dog squad and Polair were called to the neighbourhood, known as the Three Ms, to quell the huge fracas involving knives, baseball bats and at least one firearm,
Police said the fight was not gang-related but arose from a dispute between two families, fuelled by alcohol and summer heat.
Police were tipped off that people were stockpiling potential projectiles behind trees and other facades.
"...they became aware that there was a number of objects piled up, including bricks and sticks," Campbelltown Superintendent Stuart Smith told reporters.
He said everything was being done to prevent any follow-up attacks.
"We're urging people that they need to stay calm and don't involve themselves in what occurred the other night."
A heavy police presence will remain in the area over the coming days, Supt Smith said, with more arrests expected.
Acting NSW Premier Carmel Tebbutt said the government would consider a number of "options" to addressing the problems plaguing the public housing estate.
"There's no doubt that if we had've known what we know now back in the 70s when some of those housing estates where built, we might have done it differently," Ms Tebbutt told reporters in Sydney.
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