Scott Morrison has expressed relief that Cleo Smith has been found alive.
The Prime Minister tweeted: 'What wonderful, relieving news. Cleo Smith has been found and is home safe and sound.
'Our prayers answered. Thank you to the many police officers involved in finding Cleo and supporting her family.'
Cleo Smith has been found alive and well, 18 days after she vanished from a tent
Opposition leader Anthony Albanese also posted a message on his social media and thanked police for their 16-day search.
'Such happy news. Cleo Smith has been found alive and well. To all those who tirelessly searched for this little girl, you deserve our thanks,' he said.
A police team broke their way into a locked house in Carnarvon about 1am on Wednesday and found the four-year-old girl in one of the rooms.
Deputy Commissioner Col Blanch confirmed the great news just before 7am AEST that little Cleo is alive and well.
'One of the officers picked her up into his arms and asked her 'what's your name?' he said.
'She said: "My name is Cleo".'
Cleo was reunited with her relieved parents a short time later.
A man from Carnarvon was arrested at the home and taken into custody to be questioned by detectives.
'This is the outcome we all hoped and prayed for,' Deputy Commissioner Blanch said.
'It's the outcome we've achieved because of some incredible police work.
'I want to thank Cleo's parents, the Western Australian community and the many volunteers.
'And of course, I want to thank my colleagues in the Western Australia Police Force.'
The news has sparked an outpouring of relief worldwide.
'What wonderful, relieving news,' Australian Prime Minister Scott Morrison tweeted from Glasgow.
'Cleo Smith has been found and is
