A jack-knifed truck has left Waioeka Gorge on State Highway 2 blocked to all traffic this morning.

Police say the incident happened around 7.30am towards the Opotiki end of the gorge.

No one was injured but the truck had been left across both lanes.

Contractors were on their way to the area but at this stage it was not known how long it would take to clear the road.

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Police warned there were no diversions available and motorists could expect delays.

It was best to delay all travel through the area if possible, a spokesperson said.