Material found in William Tyrrell search, at Kendall in NSW

Police searching bushland have collected three pieces of evidence today in their search for William, bringing the total to 13 over nine days.

Police combing bushland in the NSW mid-north coast town of Kendall collected more evidence on Tuesday in their search for William Tyrrell, as a cadaver dog began searching a new location.

Members of the Rural Fire Service, who are clearing the search areas in advance, found a piece of dark-coloured material.

A policeman and grave archaeologist bag the 11th piece of evidence in the search for William Tyrrell. Picture: Liam Mendes

Grave archaeologist Tony Lowe and a forensics police officer documented and bagged the find.

Later in the day, police left the same search area with two more bags of unidentified evidence, bringing the total to 13 items over nine days.

Tuesday was the ninth day of the search for the three-year-old, who has been missing since September 2014.

Police are leaving no stone – or patch of dirt – unturned, seizing every piece of material found, and sending it to Sydney for analysis.

The operation is less than 1km from the home of William’s late foster grandmother, from where he went missing in 2014.

Wags the cadaver dog on the hunt for more clues after new evidence is found on the eastern side of Batar Creek road. Picture: NCA NewsWire / Peter Lorimer.

It is understood police are searching for William’s remains in the belief that he was placed in the bush rather than buried in a grave. Wags the cadaver dog is now operating in a fresh location that was cleared by RFS workers on Monday.

Officers from the Public Order Riot Squad and ­Operational Support Group are on site sifting through soil under the instruction of forensic experts, eight crime scene officers, a ­forensic grave archaeologist, an anthropologist and a ­hydrologist.