A truck full of milk is on fire on a dock in the Auckland suburb of Papakura.

Papakura station officer Kingsley Jones said a truck's engine area caught on fire at Fonterra Milk Factory but he's not sure what caused the blaze.

"It was out pretty quickly. It took a matter of minutes."

Fire Safety will investigate the cause of the fire.

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Fire shift manager said no one has been injured.

Police officers are in attendance.

Fire services put out the blaze.