A father who called triple-0 after his wife and three young children were found dead inside their home waited on his front lawn for paramedics to arrive.
Homicide Squad investigators have formed the preliminary view that a mother found dead in a Tullamarine house yesterday was responsible for the death of her three children, before taking her own life.
Emergency services were called to the property on Burgess Street shortly after 12.20pm where police located the bodies of a 42-year-old woman, a seven-year-old girl, a five-year-old girl and a three-year-old boy.
Hume Crime Investigation Unit detectives arrived at the scene to find Ambulance Victoria paramedics out the front of the property with a 48-year-old man, whom police said was the husband and father of the deceased.
In a statement released this afternoon, police said they did not believe the man had anything to do with the deaths.
In an Australian first, a new Victoria Police unit is working to cut off access to illicit weapons and says it has already netted 80 firearms since its inception in September.