Hankey Detectives arrested four suspects, aged between 21 and 23 years on Sunday evening, following the murder of a 41 year old female and a 6 year old girl in Rosedale, Hankey.
The bodies were found inside the house belonging to the adult female earlier in the evening by the neighbours who alerted the Police.
It is been alleged that the body of the adult female was found with stabbed wounds to the upper body.
The 6 year old is suspected to have been strangled.
The suspects then set the house of the deceased alight after the incident, but neighbours removed the bodies before the house could caught fire.
The suspects two males and two females were arrested. More arrests are imminent.
The motive for the killings is not known.
The suspects will appear in the Hankey Magistrates Court today on charges of murder and arson.