William Tyrrell search could take months as hessian bag sent for forensic testing

Police have scoured only a fraction of the scrub near where the preschooler disappeared

• William Tyrrell: how new evidence revived the case and triggered a fresh search effort

The renewed search for the remains of missing three-year-old William Tyrrell could take months, with investigators on day six having scoured only a fraction of the scrub near where the preschooler disappeared.

As the end of the first week of the high intensity" search draws near, police have searched an estimated 10% to 20% of the areas of interest - or about one kilometre squared.