A factory has been left badly damaged in a large fire in South Auckland last night.

Up to 18 fire trucks were called to Waokauri Place, in Mangere, just before 11pm.

A panel beater unit - Premier Panel & Paint - was well involved when firefighters arrived.

Northern fire communications spokesman Jaron Phillips said everyone who had been in the block of factory units had been accounted for and there were no injuries.

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The fire was brought under control under an hour after they were called to the scene, he said.

The cause of the blaze is not yet known.