A fire broke out at an Arataki property this morning.

A fire service spokesman said a garage and lean-to on Matavai St was "well involved" when fire fighters arrived to the scene around 9.25am.

Thick, black smoke could be seen billowing from the property and flames were dealt to by two fire units.

Investigators were establishing what caused the fire. The garage was left pretty damaged, the spokesman said.

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No one was reported injured.