A bus full of passengers travelling over the Kaimai Range has caught fire.

Firefighters from Greerton were called to the intersection of State Highway 29 and Old Kaimai Rd about 11.30am after reports the bus had caught alight.

Read more: Couple lost in Kaimais now safe

Greerton fire brigade spokesman said they were at the scene but the fire was already out when they arrived.

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The man said a small fire had started in the engine of a Naked Bus vehicle.

Passengers have left the bus and were now waiting on the side of the road.

It is understood there are no traffic delays.