The Army could be charged with arson after a live firing exercise yesterday went wrong and sparked a large scrub fire, if police believe they were reckless.
Police are working with the New Zealand Defence Force to work out how the fire started at Burnham Military Training Area at West Melton, outside Christchurch.
The NZDF will also be forced to foot the bill for fighting the blaze, police confirmed today.
Soldiers had been doing live firing training, using hand grenades and small arms, went the fire broke out on tinder-box dry scrub land.
The fire took hold quickly, fanned by dry, blustery nor-westers, and it took a massive operation with 60 firefighters and six helicopters with monsoon buckets to bring it under control hours later.