They say they're keeping an open mind about the discovery in the forest where serial killer Ivan Milat killed and buried his victims in the 1990s.
Acting Superintendent Evan Quarmby from the Goulburn Local Area Command says the investigation is in its infancy and it's far too soon for them to know exactly what's happened.
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Superintendent Quarmby has appealed for anyone with information that might assist the investigation to contact Crime Stoppers.
Trailbike riders came across the skeletal remains in a heavily-wooded area of the forest known as Dalys Waterhole yesterday afternoon.
A crime scene has been established with specialist forensic officers joining an extensive search of the area today.
