Police and the Fire Service agreed on Sunday that the fire that destroyed a residential garage in Bonnett Road, Kaitaia bore all the hallmarks of arson.
"Put it this way, there doesn't appear to be anything accidental about this," fire investigator Craig Bain said.
The first of two Kaitaia Fire Brigade appliances arrived at the address within four minutes of the alarm being raised at 2.33am, but the garage was beyond saving by that stage. The walls were still standing by the time the fire was extinguished but nothing was left to salvage, although the crews did prevent all but very minor damage to the house.
"It was a very good save," Detective Sergeant Trevor Beatson said as he surveyed the scene later that morning. The rented house, which had been vacant for several days, showed nothing more than a little bubbling of paint and minor damage to spouting.
Deputy chief fire officer Craig Rogers said the power at been turned off at the mains, eliminating the potential for an electrical explanation for the blaze.