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Firefighters have been brought in from Victoria to help the New South Wales Rural Fire Service put in containment lines near the township of Bell in the Blue Mountains, west of Sydney.
A state of emergency was declared in New South Wales on Sunday after fires destroyed more than 200 homes.
Firefighters battling wildfires in Australia have taken to 'water-bombing' woodland to halt the blaze, scooping up water from nearby rivers and dropping it on affected areas.
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Their main attention is focused on the widespread fires burning in the Blue Mountains west of Sydney, but blazes are also threatening towns in the Southern Highlands, including the small town of Balmoral.
The New South Wales Rural Fire Service is concerned that continued north-westerly winds may give the fire greater strength and help it breach their containment measures.
There were also warnings of looting in areas affected by fires, but police have warned of strong penalties for anyone caught.
The worst bushfires in New South Wales for decades are continuing to threaten communities in the Blue Mountains, west of Sydney.
Fifty-eight fires are burning across the state, with more than ten uncontained according to the Rural Fire Service.
A state of emergency was declared in New South Wales on Sunday giving the emergency services the power to order the public to leave their homes or demolish a building.
Wildfires sweeping through bushland in southeast Australia are expected to intensify in the coming days after already destroying 200 homes.
High temperatures and high winds look set to combine to make the most dangerous conditions in 40 years, with officials already declaring a state of emergency in New South Wales.
ITV News' Ben Chapman reports:
Fire officials in Australia have warned that the wildfires sweeping New South Wales are sometimes covering 30 kilometres (19 miles) in one day.
Joel Kursawe, a spokesman for New South Wales Rural Fire Service, said that he was concerned about future fires as the summer approaches.
The premier of New South Wales state Barry O'Farrell declared a state of emergency.
The fires have killed one man, destroyed a total of 208 homes in New South Wales state and damaged another 122 since Thursday, the Rural Fire Service said.
Authorities are expecting the worst as 68 wildfires continue to burn in Australia - 22 of them out of control - and dangerous weather conditions forecast through Thursday.
"There will be a significant impact on populated areas should all these forecasts materialise as is being suggested," Shane Fitzsimmons, New South Wales Rural Fire Service Commissioner, told reporters.
New South Wales state Premier has said the state is facing challenging days ahead as wildfires continue to rage in Australia. Barry O'Farrell told reporters that "the weather is not going to be as good as it had been previously anticipated".
Firefighters battling some of the most destructive wildfires to ever strike Australia's most populous state were bracing Sunday for worsening conditions, with higher temperatures and winds expected to intensify the danger in the coming days.
In the Blue Mountains west of Sydney, one of the worst-hit regions in fire-ravaged New South Wales state, more than 200 homes have been destroyed.
The Queen has sent a personal message to the Governor of New South Wales, expressing her sympathy as the Australian state battles raging wildfires.
Almost 200 homes have been destroyed in the worst hit region - the Blue Mountains west of Sydney - and another 109 have been damaged by fire.
The Queen told NSW Governor Marie Bashir today: "I would like to convey my heartfelt sympathies to all those who have been affected by the devastating bushfires across New South Wales.
"My thoughts are with the many people who have lost their homes or livelihoods in the fires and I have the greatest admiration for the firefighters, volunteers and emergency services officers who are working tirelessly to control the situation."