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Sydney fire raging on but conditions ease

sydney bush fires 2018

Police monitor for threats to homes as a bushfire threatens properties in the suburbs of Voyager Point, Pleasure Point, Sandy Point, Illawong, Menai and Bangor, in Sydney, Sunday, April 15, 2018. Homes are expected to be impacted by ember attack into Sunday night. Image: AAP Image/Brendan Esposito

Conditions have eased for a huge bushfire near residential areas in southwest Sydney but firefighters remain on alert because of the risk of high winds and temperatures during the day.

Residents endured a second nervous night on Sunday as the fire that's so far blackened about 2500 hectares continued to rage, with hundreds of firefighters working to contain the blaze.

The fire, which began on Saturday afternoon and may have been deliberately lit, was fanned by strong winds on Sunday and approached suburban streets.

Conditions on Monday are expected to help the firefighting effort, with winds at about half the strength they were on Sunday as the fire continues to burn in a south easterly direction towards Barden Ridge.

But high temperatures remain a cause for concern, Rural Fire Service Deputy Commissioner Rob Rogers warned.

"Still quite a difficult day ahead (on Monday)," he told Nine Network.

"I think we've got a long way to go before we're out of the woods."

sydney bush fires 2018 2

Firefighters fight flames close to homes in Corryton Court, Wattle Grove in Sydney, Saturday, April 14, 2018. Image: AAP Image/Brendan Esposito

The RFS cautioned that while the threat had eased, residents in the areas of Voyager Point, Pleasure Point, Sandy Point, Alfords Point, Barden Ridge, Illawong, Menai and Bangor should continue to monitor the situation and be prepared to activate bushfire survival plans should conditions change.

Heathcote Road remains closed between Macarthur Drive and New Illawarra Road, while Old Illawarra Road at Barden Ridge has re-opened.

RFS spokesman Greg Allan said on Sunday some properties had been damaged.

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

The fire tore through the Holsworthy military range and more than 500 personnel from the Rural Fire Service, Fire and Rescue NSW and the Australian Defence Force battled to protect properties.

The blaze was downgraded from Watch-and-act to Advice about 2am on Monday.

Firefighters have taken advantage of the conditions to do a back burn along Heathcote Road near Pleasure Point as well as in areas of the Holsworthy military base.

A large number of firefighters remain on the ground working to slow the spread of the fire.

© AAP 2018