Specialist police have been back combing through bushland around Kendall, where the little boy disappeared seven years ago on the morning of September 12, 2014.
Watch: NSW Police Minister David Elliot on the new William Tyrrell search. Post continues below.
Hundreds of officers descended on three new areas around the town, with the help of 30 SES volunteers.
Investigators initially focused on the home where William's foster grandmother lived and where he was last seen, searching the garden bed outside the house.
Police also seized a car from a home in Sydney last month and charged the boy's foster parents over an unrelated alleged assault on a different child.
Officers then turned their focus to an area of bushland, less than one kilometre away from the Kendall home. News broke on Wednesday that bone fragments have been found within this area.