Bush fires are out of control at several sites in eastern and coastal New South Wales.
The blazes are being exacerbated by gusty winds, the ABC reports.
At Wyee, north of Sydney, scores of firefighters are stationing themselves between homes and a large fire front.
The fire re-ignited on Friday afternoon in hot, gusty conditions, breaking containment lines and jumping several roads.
It is threatening several homes and has also forced the closure of the Sydney to Newcastle train line and put coal mining infrastructure at risk.
The Rural Fire Service's (RFS) Anthony Clark says while temperatures have dropped significantly, there is still work to be done.
"We are putting firefighters there between the properties and the fire in an effort to defend those homes," he said.
"We've seen some really good efforts right throughout the day from residents working alongside firefighters both at the Wyee fire and the fire on the central coast further south."
RFS deputy commissioner Rob Rogers says crews are also trying to protect a large coal conveyer belt.
"The fire is basically burning up against the clearing that that runs through and obviously fire crews are doing their best to protect that infrastructure," he said.
One Summerhayes Road resident - who gave his name as Ian - says it is a hectic situation.
"[There is] lots of smoke, lots of firies running around and people having a bit of a look," he says.
"The wind is blowing it everywhere."
Between Pretty Beach and Lobster Beach on the NSW central coast, around 110 firefighters and several water bombing helicopters were working into the night to control a blaze which was throughout Friday.
Earlier in the day several properties were threatened in bush near Singleton.