Christchurch's Port Hills fire started on private property but fire investigators have not determined how it broke out, according to a Fire and Emergency report into the blaze.
The fire started at the property near the Worsley Track on 14 February and spread over 700 hectares, forcing the evacuation of more than 100 properties.
The blaze triggered a major firefighting operation including more than 100 firefighters, 15 helicopters, two fixed-wing aircrafts and almost 30 fire engines.
A state of emergency was declared by the Christchurch City and the Selwyn District Council and remained in place for a week.
The blaze destroyed a container home.
The
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