A fast-moving bushfire in Sydney's southwest continues to burn out of control, with a change in the wind direction adding to the danger.
The wind is pushing the fire in a northeasterly direction towards Alfords Point and Sandy Point, and residents have been told to shelter in place.
Residents at Picnic Point are under an ember attack and have been told to activate their bushfire survival plan, an RFS spokesman said early on Sunday morning.
There has been no easing in the conditions and fire continues to spread. At the Moorebank Sports Complex, staff were feeding weary firefighters who have been battling the flames through the night.
Late on Saturday night, the fire had been moving southeastly from Holsworthy towards Wattle Grove, Moorebank, Menai, Heathcote and Barden Ridge before the wind change.
Police believe the fires may have been deliberately lit and are appealing for witnesses to come forward.
"We believe it might have been a deliberately lit fire," Inspector Mitch Newtown from Liverpool police told AAP on Saturday night.