The fire service is treating a fire in the Auckland suburb of Penrose as suspicious.
Specialist fire investigator Russel Dickson says firefighters were called to the Select Auto Parts warehouse on Neilson Rd at about 9pm on Monday.
He says it took nearly 60 firefighters about an hour to bring the fire under control; the building had no sprinkler system.
Mr Dickson says the investigation is still in the early stages but they're treating it as suspicious.
He says the building is completely destroyed and will be bulldozed after the investigation.