The bodies were discovered by a man, who claims to be a relative of at least one of the deceased, at the home in Broadmeadows.
A man calling himself Cory, far left, told police he looked in a window and saw the bodies. (Joel Carrett/AAP PHOTOS)
The man, named as Cory by Nine News and described as a family member and a neighbour, said he went to the home and knocked on the door but no one answered.
He claims to have looked in a window to see a 17-year-old boy lying on the floor. It's believed a woman and two men were also inside the home.
"I've come home to find family members in the house deceased and it just tortured me, shocked me," he told Nine's Today program.
"I think (it was) an overdose but I'm not too sure exactly."
Later in the morning, Cory was joined at the scene by several distressed people believed to be family members and friends.
Victoria Police are yet to say if the deaths were drug-related. (Joel Carrett/AAP PHOTOS)
Victoria Police were called to the home about 2am on Tuesday and an investigation is underway.
Investigators locked off the scene with police tape as forensic officers searched the back of the premises on the block where the bodies were found.
A police spokesperson said the cause of death was yet to be determined but at this stage the deaths are not believed to be suspicious.Â
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