Three people have died and a man has been arrested following a violent incident in a home in Sydney’s south west overnight. 

Emergency services were called to a home on Juliet Close, Rosemeadow just after 1.30am on Sunday following reports of an assault.

On arrival, officers discovered the bodies of a woman in her 60s and a man in his 20s. A 64-year-old man was also found with critical head injuries and later died at Liverpool Hospital.

They are yet to be formally identified.

An hour later, officers arrested a 32-year-old man after a silver sedan arrived at the scene.

Police believe he is related to the occupants of the home.

He was taken to Campbelltown Police Station where inquiries are continuing.

After police cornered off a section of the small street, officers could be seen sweeping through the boot of the sedan.

Emergency services were called to a home on Juliet Close just after 1.30am on Sunday

Police have arrested a 32-year-old man after a silver sedan arrived at the scene

Officers searched the boot of a car located near the scene 

A report will be prepared for the information of the Coroner.

More to come.