Cleo Smith found safe by Western Australia Police

Missing Western Australian four-year-old Cleo Smith has been found.

Her mother, Ellie Smith, said her family is whole again in an Instagram post alongside a photo of her daughter.

Cleo was found alive and well in a locked house 75 kilometres south from where she went missing.

Deputy Commissioner Col Blanch announced this morning "Cleo is alive and well".

A police team broke their way into a locked house in Carnarvon, a coastal town north of Perth in Western Australia, about 1am.

They found Cleo in one of the rooms.

"One of the officers picked her up into his arms and asked her 'What's your name?'" Deputy Commissioner Col Blanch said.

"She said - 'My name is Cleo.'"

A 36-year-old man from Carnarvon is in custody and is being questioned in relation to the suspected abduction.

Police say he has no connection to Cleo's family and was not present at the house when Cleo was found.

The girl has been reunited with her mother Ellie Smith and Ms Smith's partner Jake Gliddon. She is receiving medical care but is said to be in good physical health.

"This is the outcome we all hoped and prayed for. It's the outcome we've achieved because of some incredible police work," Mr Blanch said.

He thanked the WA community, volunteers and officers involved in the search for Cleo.

"We'll have more to say on the rescue of Cleo as the day unfolds," Mr Blanch said.

"For now - welcome home Cleo."

The girl vanished from a tent at the Blowholes campsite, about 950km north of Perth, after the family arrived on October 16.

She was last seen by her mother around 1.30am that night.

The search for Cleo captured national attention, including in NSW where the state's police commissioner on Wednesday recounted a call he had with WA Police Commissioner Chris Dawson after Cleo was found.

"He said when he got the call this morning he broke down and cried," Mick Fuller told Sydney radio 2GB.

Cleo Smith has been found. Photo: WA Police.

Cleo Smith has been found. Photo: WA Police.

"It's such an amazing story."

Mr Fuller praised WA Police for their "good old fashioned police work", adding he had feared the chances of finding Cleo alive were slim.

WA investigators spoke to more than 110 people who were at the campsite when Cleo went missing.

They sifted through more than 1000 calls to Crime Stoppers and trawled through vast amounts of materials for forensic clues.

They had also been searching for the driver of a car seen leaving in the campsite in the middle of the night before it was discovered the child was missing.

WA Police had suspected she was abducted by an "opportunistic" offender.

Police will hold a press conference later on Wednesday.

The state government had offered a $1 million reward for information to find Cleo.

- with Australian Associated Press

This story Missing four-year-old Cleo Smith has been found, man in custody first appeared on Newcastle Herald.