Helicopters and fire crews have been called to an “aggressive” scrub fire on the northern fringe of Taupō.

An eyewitness told 1News the blaze started as a small brush fire in a paddock before westerly winds took hold.

“Now it’s an aggressive fire, smoke so intense and covered the Taupō arterial expressway.”

The witness said traffic was being diverted.

Fire and Emergency NZ said crew were called to a scrub fire at 2.24pm.

Fire and Emergency NZ said crews, including two helicopters, were called to a scrub fire at 2.24pm on Monday. (Source: Supplied)

“On arrival they found, a fire that was 150m in length, threatening a building in Tauhara,” a spokesperson said.

“Six fire trucks, two water tanks, and two helicopters are working to cut off the spread and extinguish the fire.

“Conditions are very windy and dry, with emergency services actively working at the scene to bring the fire under control.”

Wind in the area was currently at 15 knots, or just under 30km/h, FENZ added.

Motorists were urged to delay travel or avoid the area if possible.

Broadlands Rd was briefly closed while emergency services worked at the scene, but had since been reopened.

Police thanked the public for their patience.