Two men have died in a double-shooting at a suburban house in Sydney's leafy north west last night.
Police were called to a home in Quarter Sessions Road at Westleigh following reports of shots being fired just before 8:00pm (AEST).
The bodies of two men, both aged in their thirties, were found at the house.
Both men died from gunshot wounds.
Inspector Colin Lott says police are still investigating why the shootings took place but he has confirmed the men were friends and not in a relationship.
He says the mother of one of the men was upstairs in the house and called police.
"Obviously she's affected by the situation," he said.
"We are trying to assist her with arranging counselling and obviously family and friends are coming to her support as well."
A crime scene has been established and forensic officers spent the night scouring the house.
Investigators say there is no evidence at this stage that anyone else was involved in the death of the two men.
Neighbour Ruth Cunningham says she heard multiple shots.
"I heard a few bangs", she said.
"I actually thought a house was on fire and I alarmed my son and within no time the authorities were here only to discover that there was someone I knew that we knew, my family knew, that died.
"It sounded really large and smelt it more than I heard it more than anything, I actually though there was a fire, a house fire."
Forensic officers are expected to be at the scene for some time and Quarter Sessions road has been cordoned off.
The double shooting happened just a day after a mother and her daughter were found murdered in a separate incident in their home at Auburn.