Marlborough blaze keeps crews busy

There was some concern about the chemicals being in the treatment plant, a firefighter said. Photo / File

A large fire in a sawmill has kept fire crews busy this morning in the Marlborough region.

Southern fire communications shift manager Daryl Ball said the fire broke out at Kaituna Sawmill, near Blenheim, around 4am.

The fire was in a treatment plant and fully involved a 8m by 15m building.

"There was some concern about the chemicals being in the treatment plant, so they called for a hazardous material unit, a specialist truck, from Nelson," Ball said.

"It was a decent sized job, being in a sawmill there's a fair amount of fuel."

By 8am crews were in the "overhaul and clean up mode".

Fire crews had since left the scene.