Prime Minister Tony Abbott says the thoughts and prayers of every Australian are with the people who are suffering and affected by the bushfires in New South Wales.
Mr Abbott says there has already been a reported death as a result of the fires and he fears there may be more in coming days.
He says he plans to visit some of the affected communities this afternoon.
"Australia is a country which is prone to natural disaster, but every time it strikes it hurts. And we grieve for all of those who are now hurting because of what's happening in New South Wales. I hope later today to be in at least one of the affected communities."
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Earlier, NSW Premier Barry O'Farrell confirmed a 63-year-old man had died while defending his home at Lake Munmorah in the state's north.
"This is the worst possible news," Premier O'Farrell said.
An RFS spokesman says the 63-year-old man suffered a heart attack while he was fighting a fire at his home at Lake Munmorah in the state's north on Thursday afternoon.
Attempts were made to resuscitate him at the scene but he died at Wyong hospital.
NSW Police say a report is being prepared for the Coroner to officially determine how the man died.
Meanwhile, Sydney Area Health says two people are at Concord Hospital with bushfire-related injuries.
"I've had no advice of others who are missing or feared dead," NSW Premier O'Farrell told media at a press conference this morning.
Firefighters in parts of New South Wales continue to battle multiple large-scale blazes on the Central Coast and in the Blue Mountains which are believed to have destroyed at least 100 homes. For the latest emergency warning information, visit the RFS website.
SBS World News Australia Radio reporter Nikki Canning says police have sent strike force teams to investigate the possibility of arson in the three bushfires burning in the Blue Mountains.
A Springwood resident, Nikki Canning has told SBS Radio she is preparing for the worst as the fire creeps closer to her house.
NSW Rural Fire Services Commissioner Shane Fitzsimmons says despite the cooler and more humid conditions today, the fire situation is still very active, very dynamic and very dangerous with 100 fires still burning."We cannot rule out the very real prospect that some people may not have got out."
RFS spokesman Brendan Doyle said building-impact assessment teams were on fire grounds across the state looking at property damage to houses, cars, sheds, fences and telegraph poles.
Meanwhile, weary NSW firefighters are about to get some help from interstate.
Their numbers will be boosted by crews from Victoria, Queensland, South Australia and Tasmania.
Authorities say they expect milder conditions today compared to yesterday. But they have also warned that they fear more lives may be lost and hundreds of home destroyed.
Numerous schools are closed on Friday. A full list can be seen below.
