Volunteer and professional firies from the Coast have sped down the M1 today, to play their part in the operation to control a massive bushfire burning south of Sydney.
Early this morning the threat level decreased to 'watch and act, ' and then again to 'advice, ' but firefighters have urged locals to remain vigilant and have a bush fire survival plan in place.
"We believe it might have been a deliberately lit fire", Inspector Mitch Newtown said on Saturday night. The fire has ripped through 2500 of land in Sydney's southwest.
Over the weekend the blaze was declared an emergency a number of times but was downgraded to watch and act when winds dropped down to around 15 to 25 kilometres per hour.
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. (AAP) Thick smoke has blanketed most of Sydney over the weekend.
Major roads separating bushland and residences were cut off in some areas, and fire services used helicopters to dump water over key points.
Late yesterday, the NSW Rural Fire Service (RFS) said the fire had burnt about 2,430 hectares around Holsworthy and Menai, and some properties had been damaged.
The fire continues to burn in an easterly direction towards Barden Ridge, but the threat has been reduced.
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Residents in the suburbs of Voyager Point, Pleasure Point, Sandy Point and Illawong, Menai and Bangor were warned of the danger of ember attacks as many scrambled with hoses and buckets to protect their houses.
Fire investigators were still working to determine the cause of the fire, but Mr Fitzsimmons said it was most likely deliberately lit.
A strike force has been established to investigate the blaze which is believed to have started in Casula.
Embers posed a serious threat to homes on Saturday night.
"Still quite a hard day ahead (on Monday)", Rogers told the Nine Network.
Heathcote Road, which links Holsworthy and the Royal National Park, is now closed between Macarthur Drive and New Illawarra Road.
"I think it's fair to say that it is highly suspicious, in the absence of any other cause like lightning", he said.
The RFS is now advising residents in Pleasure Point, Sandy Point, Alfords Point, Barden Ridge, Voyager Point, Illawong, Menai & Bangor to "remain vigilant throughout the day and keep themselves up to date by checking the NSW RFS website".