The renewed search for the remains of the missing three-year-old William Tyrrell may take months, with investigators on day six having searched only a fraction of the thicket near where the preschooler disappeared.
As the end of the first week of the “high-intensity” search approaches, police have estimated an estimated 10% to 20% of areas of interest – or about a square kilometer.
At that rate, the diligent effort could take up to nine weeks to complete.
Police have combed the bushland and drained a stream in an area one mile from the Kendall property where the boy’s foster grandmother lived and where he was last seen seven years ago.
A hessian bag was found and collected for forensic examination on Saturday, with at least two other pieces of fabric placed in evidence bags and sent off earlier in the week.
Investigators have also scanned a concrete slab on the property that was laid after the boy disappeared, but have since confirmed that nothing remarkable was found.
Strike Force Rosann officers test theories, William may have fallen from a balcony on the property, sifted through a garden below, and earlier this week seized a Mazda that formerly belonged to the foster grandmother, who has since died.
It comes after police this week also charged the boy’s former foster parents with an unrelated alleged assault on another child.
The couple will go to court in Hornsby on Tuesday.
The results of a coronal investigation into Williams’ disappearance, which was completed last year, have not yet been released.
A reward of 1 million. USD for information on the case is still standing.
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