New fires are burning on Great Barrier Island as firefighters work to strengthen containment lines with controlled vegetation burnoffs.
The burnoffs are within the containment area where more than 100ha of bush has already been destroyed.
Auckland Council said the new fires were a result of changes in heat and humidity this afternoon and were working to strengthen containment lines in case the fires flared up at the weekend.
There are still 45 volunteer rural firefighters positioned on the border of the containment area and a helicopter is on standby.
The council said there were no properties currently under threat.