State Highway 1 was closed in both directions south of Waiouru this afternoon as a result of a vehicle fire, police said.

Police received reports of a vehicle on fire at about 4pm, at the junction of Deacons Rd and State Highway 1.

NZTA tweeted the road was closed "due to a bus fire" between Taihape and Waiouru, near the Deacons Rd intersection. The lane has since opened, NZTA tweeted.

Police and fire officers were at the scene.

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There are no reports of injuries.

Motorists are advised to avoid the area if possible as there are no diversions in place.

The cause of the fire is not known.