Victorian authorities have joined the Tasmanian search this morning for missing four-year-old Shayla Thomas, who has not been seen for almost two days.
The little girl is believed to have wandered off from her neighbour's backyard at around 2.30 pm on Wednesday, where she was last seen with two dogs.
An extensive land and air search is now being conducted across rural pastures and dense woodland near Stormlea on the Tasman Peninsula, in south east, Tasmania.
Tasmania Police remain hopeful that Shayla will be found alive, with autumn weather and temperatures over the last few days and nights working in their favour.
Inspector Gavin Hallett said a fixed wing drone was searching until 3am into Friday, with heat-sensing technology feeding information back to the ground crews.
He said the current search is revisiting some of the areas searched in the previous days on the basis that Shayla may be walking around the area.
"We will continue the search. My object is to search until Shayla is located safe," Inspector Hallett said.
"We've checked and we have rechecked. One scenario is that Shayla is in one location, and is still mobile, and so we will go and check those areas again," he said.
"The effort is not reducing. It is maintained 24/7."
Tasmania Police have used helicopters and thermal sensing drones, cleared nearby dams, searched neighbouring properties and brought in sniffer dogs to find the little girl.
Both a search and rescue operation, and a police investigation, is underway.
On Day 3 of the search, people on horse-back are scouring a nearby pine forest and Victorian sniffer dogs and a helicopter have joined the search.
Tasmania Police Assistant Commissioner Jonathan Higgins said people have been reaching out from across Tasmania, Australia, and the world, to assist in the search for Shayla.
He said the operation had reached out to other jurisdictions who have experience in successfully locating missing children.
"Tasmania Police are doing everything we possibly can to bring little Shayla back safely to her mum, and we will continue to do that," Assistant Commissioner Higgins said.
"There are many aspects to missing people, and it is all happening, playing out here with searches on the ground, people behind the scenes doing intelligence work and looking at maps and providing extra assistance where they can."
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He said in rural searches, as opposed to urban searches, the aim was to get as many people on the ground as possible to look for the missing person.
"The mood is very professional. Whether it is our sworn members, volunteers, people who have come to help on horseback. There is a positive mood," he said.
"There will be apprehension, we are now a couple of days in, but the people who are here are searching, they are here for the right reason - to find little Shayla."
Inspector Hallett said on Thursday that concerns were growing for the welfare of Shayla.
He said the search area was based on the distance of how far a four-year-old could travel.
This has included a search on foot of a 1.2 kilometre radious, and an air search with a 2.5 kilometre radius.
Shayla has long brown curly hair and was last seen around 2.30pm Wednesday wearing pink leggings, a cream top, and gumboots.
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