Firefighters have contained a bushfire that destroyed a house in the NSW Blue Mountains.
The fire, which is believed to have been deliberately lit, is now burning in remote and rugged bushland.
It started on Saturday and flared up in dry and gusty conditions in the afternoon, breaking containment lines and engulfing a house on the outskirts of Katoomba.
Cooler weather helped fire crews gain the upper hand on Sunday and they continue to work on the fire, now burning down a valley west of Katoomba.
The Rural Fire Service (RFS) has warned Blue Mountains residents to remain vigilant.
"Even though the fire on the top of Narrow Neck Road appears to be out, we can't be too complacent, we need to keep a good watch until that fire is officially declared by the Rural Fire Service to be completely out," the service's Steve Perrott told the Nine Network on Monday.
With temperatures dropping to 17C on Monday and a 25 per cent chance of showers, crews will spend the day patrolling and mopping up the fire-affected areas.
The RFS is advising residents that smoke will be visible for the next few days.
In other blazes in NSW, firefighters are on top of the Hunter Valley bushfire at Kurri Kurri that has destroyed more than 280 hectares.
But the fire danger is expected to increase in the coming week with a return to warm, dry and windy conditions, RFS Inspector Ben Shepherd warned.
About 70 bushfires were burning across the state on Monday but none were threatening property.
