A new report into Port Hills fire has located the private property where the fire originated - but the cause remains undetermined.

The fire started on February 14 and spread over 700ha, forcing the evacuation of more than 100 properties.

FENZ District Commander Dave Stackhouse says the owner of the property in question has been ruled out as a suspect.

"We interviewed the property owner three times and he was co-operative throughout the investigation." 

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