NSW Police say "numerous exhibits" have been found in the search for missing boy William Tyrrell.
Detective Chief Superintendent Darren Bennett addressed media on Friday morning, saying police were "very happy" with the items found.
He said the items, which will be forensically analysed in Newcastle, have been able to aid in eliminating people of interest or "proving what happened to William Tyrrell".
"The message from the investigative team is what they've located so far is cause enough to keep going," Detective Chief Superintendent Bennett told reporters.
On Thursday, divers searched a small dam for William's remains near his foster grandmother's home. It is one of the many searches undertaken by police as part of a renewed operation near the home.
Renewed search for William Tyrrell to be extended
Detective Chief Superintendent Bennett said the latest operation, which he said had been hampered by "atrocious" weather conditions, would now be extended from about three weeks to six.
"The coroner has been kept appraised of our progress, the painstaking search along with evidence we've gathered in the course of the investigation," Detective Chief Superintendent Bennett said.
"And we will continue the timeframe of this search which may be extended now because of the setbacks with regard to weather and the processes we have to undertake if we find something."
William disappeared from his foster grandmother's property at Kendall in September 2014. He was three years old when he vanished.
Friday marks the 12th day of the renewed search.
Police have so far dug up a garden at the Kendall property, examined a concrete slab laid after William disappeared, drained a nearby creek and sifted through soil in bushland and around the home.
Specialist police divers have also searched a septic tank and water tank.
Pieces of clothing are believed to be among the items collected.
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