They also, for the first time, said they might find the missing toddler's body.

Detective Inspector Gary Jubelin said there were numerous reasons for the search through dense scrub in the Queens Lake State Conservation Area.

“Of course that would include a body,” Det Insp Jubelin said at Tuesday's press conference.

He, however, refused to detail what had been found.

The Strike Force Rosann leader also wouldn’t say if officers had spoken on Tuesday with the Bonny Hills tradesman whose home and businesses were extensively searched last month.

“The success of this investigation is not based on this one search,” Det Insp Jubelin said.

Up to 30 officers will continue combing the bush throughout the afternoon and will return on Wednesday morning. The search is expected to finish by 3.30pm Wednesday.

Earlier Tuesday: Police will search an area of about two kilometres squared today as the investigation into William Tyrrell’s disappearance continues.

The search will end at 5pm on Wednesday, however police stressed this is likely to be just one search of many to come.

Chief Inspector Colin Green said the group had covered about 500 metres stretching across both sides of Long Point Trail on Monday.

“We’re searching bushland for anything and everything,” he said.“This is an active investigation - the focus is on finding anything related to William disappearance.”

Anyone with information about William’s disappearance is urged to come forward via Crime Stoppers. Police are urging anyone with information in relation to this incident to call Crime Stoppers on 1800 333 000 or use the Crime Stoppers online reporting page.

* William Tyrrell's names was formerly spelt "Tyrell". Police have now advised the correct spelling is "Tyrrell"