One person has died and another has been injured as Australia battled "catastrophic" fires across the country.
In New South Wales, sudden southerly winds fanned the flames of more than 100 blazes.
Fire officials said a man who had chosen to stay at his property could no longer be contacted.
Meanwhile a person in South Australia was confirmed as the latest casualty on Saturday and 15 homes were destroyed by a fire 25 miles from state capital Adelaide.
Prime Minister Scott Morrison has cut short a holiday in Hawaii after facing intense criticism for leaving amid the crisis.
It follows the deaths of two volunteer firefighters who were battling blazes in New South Wales, the country's most populous state on Thursday.
Around 7.4 million acres of land has burnt nationwide during a torrid bushfire season, with nine people killed and more than 800 homes destroyed.
Catastrophic fire conditions have been declared in NSW as temperatures were forecast to reach 47C (115F) in western Sydney on Saturday.
NSW Rural Fire Services Commissioner Shane Fitzsimmons said: "Catastrophic fire conditions are as bad as it gets.
"Given we have a landscape with so much active fire burning, you have a recipe for very serious concern and a very dangerous day."
In South Australia, authorities said 23 firefighters and several police have also suffered, as more than 40,000 hectares (98,842 acres) of land burnt.
"It is going to be a real scene of devastation, especially for those people in the Adelaide Hills who have been most affected," South Australia Premier Steven Marshall said.
"We know that in addition to the buildings and vehicles lost there are very significant losses in terms of livestock, animals, crops, vineyards."
The annual Australian fire season, which peaks during the Southern Hemisphere summer, started early after an unusually warm and dry winter.
The devastation has put pressure on Prime Minister Scott Morrison, who has received criticism for going on a family holiday in Hawaii during the wildfires crisis.
He apologised on Friday for "any offence caused to any of the many Australians affected by the terrible bush fires by my taking leave with family at this time".
He cut short his holiday and returned home on Saturday night. He is due to visit the New South Wales Rural Fire Service headquarters on Sunday.
Debate has reignited on whether Mr Morrison's conservative government has taken enough action on climate change. Australia is the world's largest exporter of coal and liquefied natural gas.
Fatih Birol, International Energy Agency executive director, believed Australia had missed opportunities to mitigate the impact of coal.
"I find the Australian energy debate far too emotional, far too nervous and far too hot. It is hotter than the climate change itself," he told The Sydney Morning Herald and The Age.
Mr Morrison, who critics have deemed a climate change sceptic, conceded earlier this month that "climate change along with many other factors" contributed to the wildfires.
