Firefighters were this afternoon dampening down hotspots at a large scrub fire in Northland.

The Fire Service was alerted to the blaze at Mitimiti, 70km south of Kaitaia, about 1.45pm, northern fire shift commander Steve Smith said.

Three helicopters were brought in to help contain the 10ha blaze.

It was not yet known how the fire started.

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"We won't know for quite some time if it's suspicious,'' Mr Smith said.

No buildings were in the area.