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Police have revealed the renewed search for the remains of missing three-year-old William Tyrrell could take months as they dig up one square kilometre of bushland.
Police are focusing on three potential covert burial sites within 700m of William's late foster grandmother's home in Kendall, on the NSW mid north coast.
The three-year-old was last photographed on the balcony of the property in 2014.
On Saturday, the sixth day of the search, police admitted the wide scale dig could take months - despite initial reports the investigation would take several weeks.
A rarely seen picture taken minutes before the last time William Tyrrell's foster parents saw him, playing with his sister on his foster grandmother's balcony
The major development comes after police dug up and raked through dirt and drained a shallow creek in an area of bush a kilometre from the property on Friday.
A piece of fabric was collected from
