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NSW Cops seek forensic Tyrell evidence

Police teams have descended on the NSW mid-north coast town of Kendall to search bushland for forensic evidence that will prove three-year-old William Tyrrell disappeared because of human intervention - not misadventure.

For the next four weeks, teams of experts and hundreds of emergency services workers will conduct a sweep around the property near Port Macquarie, where William was last seen on the morning of September 12, 2014.

They hope some evidence, which can be given to a criminal court or coronial inquest, will be found in the three kilometres of dense bushland surrounding the quiet street.

Speaking to media at Kendall on Wednesday morning Detective Chief Inspector Gary Jubelin wouldn't confirm if specific information had led to the fresh search.

But he acknowledged the NSW coroner would be overseeing their efforts - and did not rule out the investigation would become an inquest if nothing was found.

"I want to stress we have numerous lines of inquiry including persons of interest that we are going to fully exhaust before the matter goes to a coroner," he said.

Det Insp Jubelin believes people do know what happened to the boy and reiterated the $1 million reward for information leading to William's recovery.

"I strongly believe that there are people out there who have information on this and I want to make a point to those people that if you do have information concerning what happened to William, you are committing an offence if you do not come forward."

There are hundreds of people on the persons of interest list, but few were considered high priority, he said.

Investigators were quizzed on why it has taken four years to begin searching for forensic evidence but Det Insp Jubelin said it was "appropriate" to search again now.

The initial search focused only on finding "a little boy lost", he said.

The new search, he said, will document areas combed by police and any hard evidence they find of William.

"So we can show, beyond reasonable doubt, that William's disappearance was the result of human intervention and not through misadventure," he said.

Up to 50 officers carrying brown science bags have spent Wednesday morning filtering in and out of the cordoned-off bush track as the fresh search kicked off.

Det Insp Jubelin said time was no barrier with forensic evidence but acknowledged concerns the boy would not come home.

"We have grave, grave concerns and it has been a very long time," he said.

"But until we know conclusively that William is not alive we'll treat it with the possibility that he is still alive."

William's foster family have never given up hope of finding the boy, and on Wednesday posted a message to social media.

"Today marks 1370 heartbreaking days since William disappeared," it read, ending with: "He is in our hearts always ... Always"

© AAP 2018

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