Photo: MJF Productions Australia
It appears a firebug started yesterday's raging inferno at Kurri Kurri, which caused damage to properties and put lives at risk.
Police are treating the fire as suspicious, with special arson investigators to spend the day looking for clues in a bid to catch the culprit.
"If anyone saw any suspicious vehicle or persons in the area at around 3:00pm, particularly if they were lighting fires, obviously we'd want them to contact police," Acting Inspector David Bender said.
The more than 700-hectare fire isn't posing any threat to homes this morning.
The RFS is hoping to have it contained later today as it continues to burn to the north of the Hunter Expressway around Loxford and Sawyers Gully.
Easing weather conditions overnight helped 15 Fire and Rescue crews and 11 RFS crews consolidate containment lines.
Although light rain made it tricky to backburn.
At this stage no homes have been lost, however it looks like some sheds have been destroyed.
At least one home in Butler Parade in Kurri Kurri suffered damage from embers.
The Hunter Expressway is open this morning, along with the M1 at Killingworth which was affected by a fire west of Barnsley yesterday
That blaze is listed as 'being controlled'.
See photos and videos of the Hunter's bushfire emergency HERE.