A couple has died as part of the bushfires that ripped through northern NSW earlier this week, police have confirmed.

Key points: Four separate fires burnt within about 100 kilometres of each other on Tuesday

Four separate fires burnt within about 100 kilometres of each other on Tuesday On Wednesday, police described one of the fires as "suspicious"

On Wednesday, police described one of the fires as "suspicious" However, the fire at Long Gully where the two deaths occurred was started by a lightning strike

The bodies of Robert Lindsey, 77, and Gwenda Hyde, 68, were found inside a home on Deadman Creek Road in Coongbar.

"Unfortunately, a short time ago, two human remains have been identified," Superintendent Toby Lindsay, from Richmond Police LAC said.

"The coroner has been advised by detectives of these deaths."

The pair had been together for three years and were well-respected members of the wider Ewingar community.

They had a number of livestock at their property that either did not survive or were seriously injured, the NSW Rural Fire Service (RFS) said.

Gwenda Hyde and Robert Lindsey were found dead in their Coongbar property. ( Supplied )

The area around Deadman Creek Road was burnt by a fire at Long Gully on Tuesday, as four separate blazes raged within about 100 kilometres of each other in the state's north.

On Wednesday, police said they were investigating a "suspicious" fire that caused widespread damage and destruction in nearby Rappsville on Tuesday.

However, the Long Gully fire is not being treated as suspicious.

Early NSW Rural Fire Service investigations indicate it was started by a lightning strike on September 5.

A home alight in Rappville, northern NSW on Tuesday. ( ABC News: Matt Coble )

RFS Commissioner Shane Fitzsimmons said the deaths were a "tragic, horrible" outcome.

"[It's] a truly sobering reminder of the ferocity of these dangerous and destructive fires that we have seen burning across northern NSW for months now," he said.

Mr Fitzsimmons said the property the remains were found in was very isolated and surrounded by pine forest.

"You're not talking about a property in a village, sharing neighbours," he said.

A total of 29 homes in several areas were destroyed by the fires, which took hold in hot, windy conditions on Tuesday.

The RFS said no other people remained unaccounted for.

Dozens of fires are still burning across the state.

Since July a total of 400,000 hectares have been razed by bushfires across the north-east of NSW.

Mr Fitzsimmons said that was twice the area burnt during the same period last year.