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Two people dead, seven missing as wildfires rage across northern NSW

Unprecedented bushfires across New South Wales have claimed two lives and with seven more people missing authorities expect the death toll to rise.

The NSW Rural Fire Service said the number of homes destroyed in the blaze has risen to at least 150.

The fire service said a body was found in a burnt-out car on the Kangawalla fire ground, near Glen Innes, with police working to formally identify the victim.

A woman who was discovered by firefighters in the same blaze yesterday - in an unrelated incident - was treated for burns before being transferred to hospital where she later died, NSW Rural Fire Service commissioner Shane Fitzsimmons said.

"We can't rule out the really grave concerns that there could be more losses or indeed more fatalities as we get through and identify details across these fire grounds," he told reporters in Sydney.

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Strong winds are pushing thick smoke across the Tasman along with orange dust that's been settling in some areas. Source: 1 NEWS

Australian Prime Minister Scott Morrison said army reservists could be deployed "if necessary".

While they aren't trained firefighters they could help create firebreaks away from the front or provide accommodation and logistical support, Mr Morrison told reporters.

"These fires have already claimed two lives ... and as we get access to further areas that have been cut off we are expecting worse news again," he said.

More than 80 fires are burning across the state with more than 40 uncontained. Two remain at emergency warning level at Hillville south of Taree and Stockyard Flat near Walcha.

Authorities have appealed to people to register both themselves and any loved ones they are concerned about.

Mr Fitzsimmons said conditions were expected to worsen throughout the day as winds pick up in the afternoon and with no rain forecast throughout the weekend.

He said the blazes had resulted in "significant and widespread damage and destruction" to people, families, home-owners and the wider community with reports of damage to other buildings including a school which was destroyed.

Mr Fitzsimmons said the blazes they battled yesterday - at one point fighting 100 fires, a record 17 of which were at emergency level all at once - had them in "uncharted territory", with seasoned firefighters of some 60 years experience saying they had never seen such conditions.

RFS deputy commissioner Rob Rogers said firefighters dealt with "horrific" and "traumatic" scenes including helping residents suffering burns and heart attacks.

Dealing with multiple blazes raging at the same time had left crews "torn between trying to send help from one fire to another", Mr Rogers told Nine News.

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Firefighters say they're in "uncharted territory" and warn they can't get to everyone. Source: 1 NEWS