Both southbound lanes on the Hawke's Bay Expressway were covered with diesel after a spill on Tuesday night.

Emergency services were called to State Highway 2, near Frimley, about 9.15pm on Tuesday.

A Fire and Emergency New Zealand spokesman said a 1000 litre container came off a vehicle.

Police said the spill covered both southbound lanes of the Expressway. Two fire trucks were called to the scene.

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"Fire fighters contained the spill and assisted with decanting with the remaining of the diesel," a FENZ spokesman sad.