Police have identified up to 20 sex offenders who live near the campsite where missing child Cleo Smith was last seen five days ago.
Meanwhile, West Australian detectives have confirmed they are investigating nearby campers' claims they heard the sound of 'screeching' tyres in the early hours of Saturday morning.
In a radio interview on Wednesday, Assistant WA Police Commissioner Darryl Gaunt said police were not ruling any possibilities out about what may have happened to the four-year-old.
Cleo disappeared from her mother and step-dad's tent at the Blowholes campground near Carnarvon, on WA's remote northwest coast - and searchers haven't found a trace of her since.
Cleo vanished from the Blowholes campground near Carnarvon, on WA's remote northwest coast, in the early hours of Saturday morning
'We haven't ruled it (the car sounds) out or in, it's a little bit unsubstantiated but we're not ruling it out,' Mr Gaunt told 6PR Radio on Wednesday.
'We have a lot of information from people within or who have been in the area.
'They have reported certain noises or activities - most have been explained.'
Daily Mail Australia exclusively revealed that Cleo had asked her parents for a sip of water at about 1.30am on Saturday in the final 'interaction' she had with her parents.
Some campers said they heard the sound of a car speeding off later at 3am.
When her mother Ellie Smith and stepdad Jake Gliddon woke up at 6am their daughter was gone.
Ms Smith told reporters this week that the tent's zipper was completely open when they woke up and Cleo's sleeping had vanished.
Assistant Commissioner Gaunt added that in the Carnarvon area there are 'between 10 and 20' known sex offenders, but following inquiries none are suspects into Cleo's disappearance.
'We don't have any concerns about that,' he said on 6PR Mornings.
'I know part of the investigative strategies have included reaching and making inquiries into their whereabouts and movements, and this point in time we're very comfortable where we sit with those inquiries.'
He said detectives had received information from people 'from around the world' adding police are treating the little girl's disappearance as a 'search and rescue mission'.
'To say we're treating this as an abduction is not correct, we're treating it as a search-and-rescue mission, first and foremost, and that remains our mission,' he said.
More to come.