A large fire in an industrial area in the Auckland suburb of Onehunga has kept firefighters busy.

The blaze started around midnight.

Fire service spokesman Paul Radden said the building was used as a car storage facility.

"Fifteen fire trucks from the greater Auckland area responding. This is approximately 60 firefighters. The building was used as a car storage facility. The fire is now contained."

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Mr Radden said fire crews were still dampening down hot spots.