Detectives investigating the shooting death of Rami Iskander in Sydney's south-west are pursuing multiple lines of inquiry, including whether he was targeted for planning a revenge attack, the ABC understands.
Mr Iskander was shot outside his Knox Street home in Belmore just before 4am on Saturday.
One line of inquiry being explored is whether the 23-year-old was targeted for planning to avenge the fatal shooting of his uncle, underworld figure Mahmoud "Brownie" Ahmad, who was gunned down in Greenacre last month.
Another theory is whether Mr Iskander was involved in the shooting of senior Comanchero bikie Tarek Zahed, 41, and younger brother Omar at an Auburn gym last Tuesday.
Thirty-nine-year-old Omar died while his older brother remains at Westmead hospital in a stable condition.
Senior detectives are also looking into whether all three attacks are linked.
Deputy NSW Premier and Police Minister Paul Toole described the Belmore shooting as an "insidious crime" and vowed to crackdown on gang violence.
"Our police will continue to be out there in force, they will continue to be on the beat and they will continue to bring these criminals to justice," Mr Toole said.
"This is about retribution with some of these Sydney gangland wars we're seeing … but we're not going to tolerate this kind of behaviour.
Mr Toole said Operation Hawk — a police taskforce established to target organised crime in Sydney — had led to more than 250 arrests and over 800 charges since it launched last October.
At least 11 people have been killed in gang-related crime in the state in less than two years.
Shadow Police Minister Walt Secord has accused the state government of failing in its fight against organised crime.
"We have a situation in Western Sydney where gangland violence is running rampant," Mr Secord said.
"If this was happening in Sydney's east or the north shore arrests would have been made a long time ago."
Some Belmore locals where Saturday's fatal shooting took place called for more action from police and the state government to curb the violence.
"[The police and the government] should take it seriously now," one resident said.
"[There've been] too much [killings].
"I used to live in Guildford and that's why I left Guildford, and now here, it's the same story."
