Firefighters are attending a small scrub fire on the side of the motorway in South Auckland this afternoon.

Motorists are being urged to drive carefully on the south-bound lanes of the Southern Motorway, near Redoubt Road.

The Fire Service was called to the spot about 3.30pm following reports of a scrub fire.

A Northern Fire Communications spokeswoman said crews had left the area shortly afterwards, after attending to the blaze, but had been called back about 4.40pm after it flared up again.

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One fire truck remains at the scene.

The NZ Transport Agency is warning motorists to take extra care as emergency crews work at the site.