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A Greytown man who opened his window in the early hours to see several buildings on his street ablaze said the scene was like "Armaggedon".
Firefighters have been battling the fires since about 4am, and are treating them as suspicious.
One of the buildings is still smouldering and the roof appears to have caved in.
A local man on Wards Line said he woke in the early hours to the sound of banging, and thought someone was out shooting.
"But it got louder and I thought 'no, that's not shooting,'" he told NZME.
He opened his window to see the house north of his was on fire. He then opened the curtains and realised two homes, a barn and several outbuildings were also on fire.
"I thought 'it's Armaggedon' . . . it was terrifying."
The scene at Wards Line. Photo / Mark Mitchell
The resident got dressed and went outside to find one of the neighbours whose home it was running down the street.
"It's not pleasant to sit there and watch someone's house go up in flames and there's nothing they can do about it."
Nobody heard or saw anything before the fires started, she said.
Carterton Mayor Ron Mark had spoken to firefighters at the scene and said, while the cause was still to be confirmed by police and fire investigators, it appeared the fires were started on the outside of buildings, with multiple structures catching fire.
"You know, one after the other indicates highly an arson attack to them."
Mark has told Stuff that one of the buildings was set on fire while firefighters were trying to put out a separate blaze.
Police are assisting Fire and Emergency NZ at the scene. Photo / Mark Mitchell
Authorities are investigating the circumstances behind the suspicious fire in several homes and buildings on Wards Line.
A neighbour across the street from the blazes said they knew all the people affected and it was "pretty devastating for everyone".
The homes and at least one barn are affected at two locations on the same road.
When fire crews arrived, they realised other homes were on fire on the same street - and raised the situation to a fourth alarm.
Up to eight fire engines and three tankers were at the scene as well as other support vehicles, but the fires have now been put out.
Firefighters at the scene of the blazes. Photo / Mark Mitchell
There are no reported injuries at this stage. However, authorities confirmed the fire is being treated as suspicious and up to five specialist investigators are at the scene.