There are mounting concerns for little Cleo Smith's safety as the search for the missing four-year-old at a remote campground enters its fourth day, with close friends of the family warning 'she would not have wandered' off.
The four-year-old was last seen by her mother Ellie Smith in bright pink pyjamas about 1.30am on Saturday inside the family's shared tent at Blowholes campsite, north of Carnarvon, in Western Australia.
Ms Smith and her partner Jake Gliddon had an 'interaction' with the youngster in the middle of the night, but she was nowhere to be seen when they woke up at 6am and her grey and red sleeping bag was also missing.
Her biological father Daniel Staines spent nearly three hours in Mandurah Police Station on Monday, 1,000km south from where Cleo disappeared, after voluntarily coming in to give a statement.
Investigators have not ruled out anything in relation to her disappearance - and are exploring theories she may have been abducted with homicide detectives working 'a million miles an hour' to find her.
Police refused to confirm reports a car was heard skidding as it left the area around 3am on Saturday, after other campers reported the odd noise.
Meanwhile, social media sleuths who are trying to crack the case from home have shared several other concerning possibilities.
There are mounting concerns for little Cleo Smith's (pictured with her mum Ellie and partner Jake Gliddon) safety after she went missing at a remote campsite on Saturday morning
The four-year-old (pictured) was last seen by her mother Ellie Smith in bright pink pyjamas about 1.30am on Saturday inside the family's shared tent at Blowholes campsite, north of Carnarvon, in Western Australia
The camp ground is located 75km from Carnarvon and 875km from Perth with nothing but bushland and scrubs in between
1. Swept out with the tide
One possibility is that little Cleo may have woken in the night and wandered toward the nearby ocean, only to have fallen off a dangerous cliff and been swept away by rising waters.
The tide was at its lowest at 12.51am and gradually rose until 6.16am, when it reached high tide.
First light occurred at 5.25am, while sunrise was recorded at 5.48am.
While the area is known for strong tides, exhaustive marines searches over the past three days have so far found no evidence Cleo and her sleeping bag entered the water.
'The searches we have done for this marine environment are the best we can get and they have done the best they can, and in that environment we haven't found any sign of Cleo,' Inspector John Munday who is leading the police search said on Monday.
'And that marine search has been scaled back at this time.'
One possibility is that little Cleo (pictured) may have woken in the night and wandered toward the nearby ocean, only to be swept away by rising waters. But so far marine rescuers have found no evidence of this
The Blowholes campsite is also known as Point Quobba (pictured) and is a popular but remote camping destination
The desperate search is entering its fourth day with police releasing footage of the remote campsite (pictured) where she disappeared
A chart shows waters were at low tide on the night Cleo went missing without a trace from her mum's tent
2. Fell down a hole-in-the-ground toilet
The grounds of the campsite and surrounds are flat and bare, making it easy for helicopters to scan the area from the skies above.
But locals and passersby who have visited Blowholes before say the site is littered with sheds and drop holes usually used as toilets.
There are fears Cleo may have wandered off in the dead of night, only to fall into one of the many holes nearby.
'Are the toilets out there "long drops" still or done up? How far away are the toilets from their camp?' one person asked on the Bring Cleo Smith Home Facebook page.
'Just asking did anyone check?'
SES crews, volunteers, Indigenous bush trackers and homicide police confirmed they have been on the scene tirelessly searching the surrounds for three days but found nothing.
Those close to the family have also dismissed the idea.
'She is an intellectually advanced little girl,' a family friend told the West Australian.
'She is a smart little girl and she would not have wandered.'
There are fears Cleo (pictured) may have wandered off in the dead of night, only to fall into one of the many holes nearby. But close family friends insisted the four-year-old wouldn't do that
SES crews, volunteers, Indigenous bush trackers and homicide police confirmed they have been on the scene tirelessly searching the surrounds for three days but found nothing
3. Abduction
The most widely accepted theory circulating online is that little Cleo was abducted.
Police say they have grave concerns for the child and that 'everything is on the table' in the unusual and disturbing case.
Late into the third day of the search investigators made a public plea for anyone who was anywhere near the campsite from Friday to Sunday, to come forward and contact police - particularly if they have dashcam footage.
