Fresh search for William Tyrrell ends

A large-scale search of bushland on NSW's mid-north coast has found no signs of missing boy William Tyrrell, leading detectives to believe he was almost certainly abducted.

A team of specialist officers led by the homicide squad started the fresh forensic search on June 13 in an area near his grandmother's home in Kendall, where he was last seen in September 2014.

No evidence of William was found during the operation, which wrapped up on Thursday.

But detectives have "gathered information relevant to the investigation".

"The homicide squad's Strike Force Rosann are continuing their inquiries into the suspicious disappearance of William Tyrrell and remain focused on providing answers to his family," NSW Police said in a statement.

The search was designed to rule out William dying in a case of misadventure.

It's understood investigators have returned to their theory that he was snatched.

Detective Chief Inspector Gary Jubelin, who oversaw the 50-strong search party, previously said new leads had emerged from the investigation.

It was hoped the swarming police presence around the town would put "pressure" on anyone who had held back information from investigators.

"There is a person out there who knows why we are searching this area and will no doubt be feeling pressure from the intensity of the investigation," Det Insp Jubelin said in June.

Deputy State Coroner Harriet Grahame spent time at the search site this week. However, the case has not been referred to the coroner for an inquest.

A $1 million reward for information that leads to the recovery of William remains on offer.