A tow truck with a van on its trailer have been destroyed in a suspicious blaze at an Auckland automotive yard.

Northern Fire Shift manager Megan Ruru said a truck and van parked in a Mt Eden automotive business were burning fiercely when the alarm was raised at 2.20am.

The burning vehicles were parked next to a building and firefighters held concerns flames would spread causing further damage.

"It seems as though the building has been saved," she said.

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The fire was considered suspicious.

Police and fire safety officers would be returning to the scene to investigate.