"The Fire Service spent a further two and a half hours damping down hot spots.
"The prompt reporting of this fire to emergency services undoubtedly prevented properties in the area being damaged by the fire."
Anyone who may have seen any suspicious activity near the intersection of Kay Ave and Batten Grove between 1pm and 2pm yesterday was asked to contact the police.
Mr Dean said any witnesses may be able to provide information that would help with police investigations.
Anyone with any information can contact police on (03) 313 6167 or information could be provided anonymously by calling Crimestoppers on 0800 555 111.
Meanwhile, police were yet to confirm whether a house fire on Batten Grove was caused by the plantation fire.
Yesterday, fire investigators were at the scene of the house fire, hoping to establish whether the fire began as a result of the the forest fire, or if it was a separate incident, southern fire communications shift manager Riwai Grace said.