An 18-year-old man has been charged over an alleged conspiracy to murder a man in Sydney's south-west after detectives accused him of using a drone to conduct surveillance.

NSW Police said Taskforce Falcon detectives arrested the teenager in Silverwater at about 8:50am on Monday, September 28, following further inquiries into an alleged organised-crime conspiracy.

The investigation began earlier this month under Strike Force Naleto. Police said officers from the State Crime Command's Taskforce Falcon, assisted by the Raptor Squad and Homicide Squad, arrested two men aged 18 and 19 in West Hoxton on September 11.

Those two men were subsequently charged and remain before the courts. Police said a 28-year-old woman has also been charged in connection with the investigation.

Following further inquiries, detectives arrested the 18-year-old man in Silverwater. Police allege he was operating a drone to conduct surveillance as part of the alleged conspiracy.

The teenager has been charged with conspiring and agreeing to murder a person, participating in a criminal group and contributing to criminal activity. He was also charged with possessing equipment allegedly intended for serious criminal activity and failing to operate an unmanned aircraft within visual line of sight.

NSW Police said the teenager was refused release and was remanded in custody. He was scheduled to appear before the Bail Division of the Local Court on Tuesday, September 29.

Police have not publicly identified the intended victim or provided details about the alleged murder plan. The investigation remains active, and detectives are continuing inquiries into the alleged conspiracy.

The case involves multiple police units, including specialist detectives from State Crime Command and the Homicide Squad. Their investigation is focused on establishing the circumstances surrounding the alleged conspiracy and the roles allegedly played by those charged.

The alleged use of a drone has added another element to the investigation. Police allege the aircraft was used for surveillance, rather than simply being operated recreationally.

The charges against the teenager are allegations and have not been proven in court. The other people charged in connection with Strike Force Naleto also remain before the courts.

Police are continuing to investigate alleged organised criminal activity associated with the case and have appealed for information that could assist detectives.

Members of the public with information relevant to the investigation are being asked to contact Crime Stoppers. NSW Police said information can be provided confidentially.

The investigation is ongoing, and further charges or developments may follow as detectives continue examining evidence connected with the alleged conspiracy.