Sydney bushfire still out of control and may have been deliberately lit

Sydney bushfire still out of control and may have been deliberately lit

Residents in Sydney's south-west are breathing a sigh of relief after a severe bushfire that has burnt more than 2,400 hectares eased overnight.

But on Sunday morning the NSW Rural Fire Service downgraded the bushfire to a "watch and act" alert.

It's unclear if Friday's fires reignited on Saturday or if someone may have deliberately lit the blaze which has now burned through nearly 2500 hectares of bushland focused on the Holsworthy military range.

Sydney Trains has closed the Airport Line between East Hills and Glenfield due to a grass fire at Casula, which is near where the fire started.

The blaze was downgraded from watch-and-act to advice about 2am on Monday.

"Firefighters are in these areas and are ready to undertake property protection if required".

More than 70 fire appliances were stationed along roads dividing bushland from homes while helicopters were dumping water on the fire from above, SBS reported.

Greg Allan from the NSW RFS said that was where resources were being focussed.

"We have had reports of impact on properties in west Menai and Barden Ridge but our crews at the moment are exclusively focused on fighting the fire", he told AAP in the evening.

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"Residents in Illawong, Bangor and Picnic Point are experiencing ember attack and should continue to monitor for any new spot fires in the affected areas".

Many residents in Menai chose to remain at their homes and were kept busy fighting ember attacks.

Exhausted firefighters are facing another "challenging and difficult" day battling a bushfire, believed to have been deliberately lit, that is still burning out of control south of Sydney.

"It was pretty scary", he told AAP when finally opening a beer, thankful his house came with sprinklers on the roof.

Waterbombers were on the scene throughout the afternoon, however windy conditions are hampering firefighters's efforts.

The temperature may remain a cause for concern, according to the RFS Deputy Commissioner Rob Rogers.

New South Wales fire crews spent a second long night taking advantage of cooler conditions to back burn and protect homes in the Holsworthy area.

"Still quite a hard day ahead (on Monday)", Rogers told the Nine Network.

"I am not being dismissive of the loss in any way, but the fact is that's the loss we are talking about rather than people's homes being badly damaged or destroyed", he said.

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