The boy, 17, died in Blacktown on Wednesday
Police are investigating whether the death of a teenage boy in an alleged brutal brawl came about in 'postcode wars' between wannabe gangs in Sydney's west.
The boy, died on the streets of Blacktown about 10pm on Wednesday night after he and several others were allegedly stabbed.
Two teenage boys, both aged 15, were taken to Westmead Children's Hospital. One was in a critical condition on Friday morning.
Police believe about a dozen people were involved in the alleged deadly brawl.
Several were arrested in the following hours following an intense search via PolAir helicopter.
One adult, 21-year-old Panashe Karise, plus four 17-year-olds have been charged with a series of offences. A boy, 13, was also arrested, but has not been charged.
Overnight friends flooded social media with tributes the 18-year-old, an aspiring rapper.
One said 'fly high young king', another described him as a 'soulja' and several said 'long live Ollie'.
The death comes exactly four weeks after 16-year-old boy Jason Galleghan was allegedly beaten to death inside a Doonside housing commission home, just kilometres away.
Superintendent Steve Eggington from Blacktown Police confirmed that 'postcode wars' were also a line of inquiry for detectives in this latest alleged incident.
'It's part of the investigation at the moment,' said Supt Eggington, who added the alleged violence was 'quite confronting'.
'It's tragic we're getting young kids involved in these types of incidents.'
Confronting video showed officers leading a young man from the scene, his hands in paper bags to preserve evidence.
During a line search on Thursday, officers allegedly found broken butcher's knives and batons scattered around the streets.
The crime scene stretched for about a kilometre, police said.
Police believe the brawl involved two different groups and are appealing for CCTV or any in-car video from witnesses.
Police performed a line search through the streets of Blacktown searching for evidence on Thursday
Police forensics and detectives discuss their search during the investigation on Thursday
Karise was charged with offences including affray, car owner not disclose identity of driver/passenger, driving motor vehicle while licence suspended, and not comply with the public health orders.
He was granted bail by Blacktown Local Court on Friday with strict conditions, including that he not go near or approach any prosecution witness or go within 1km of William St, Blacktown.
Karise is not to leave his home between 8pm and 6am.
The 17-year-olds were each charged with affray and failing to comply with the public health orders.
All four have been refused police bail. Two will appear in Parramatta Children's Court today, while the others will face court in the coming weeks.
Cherubic face of Sydney's 'postcode gang wars' is seen for the first time since he was allegedly lured to a squalid home by a teen mum and beaten to death - as his mates promise his senseless end WON'T be forgottenWith kind eyes and still chubby cheeks, this is Jason Galleghan - the boy, 16, who was allegedly beaten to death by a pack of teenagers in Sydney's west four weeks ago.
Four boys and two girls - aged between 13 and 19 - have been charged with Jason's murder after he was allegedly bashed at a Doonside housing commission home.
Jason's mother gave permission for his identity to be published, as his best mate launches an effort to stamp out senseless youth violence.
Jason was a caring, kind and empathetic person who loved helping people and 'never hurt a soul', grieving friend Ouwais Menzel told Daily Mail Australia.
Growing up in South Coogee, they liked going to the beach together and bodysurfing. Jason even had dreams
