They burned down historic DoC homestead - so why aren't they being charged?
Police can't prove the blaze was deliberately or negligently lit.
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Latest fromFires
Woman credits smoke alarms for saving her life
The owner of a house that caught fire as she slept overnight says smoke alarms save her.
Tesla Model S 'spontaneously' burst into flames
The latest claims come amid increasing scrutiny over Tesla's safety.
Watch: Greymouth commercial building fire 'deliberately lit'
Fifty firefighters worked to contain the blaze on Tainui Street.
Fires, vandalism as prisoners riot at Whanganui Prison
Chaos overnight with windows broken and a fire started by inmates at Whanganui prison.
The H Files: Ruse led to fireman's death
Fire engine crashed, brigade man's skull fatally crushed after malicious false alarm.
Seven fire trucks rush to Grey Lynn blaze
Nearly a dozen fire trucks rush to house blaze in Grey Lynn.
Suspicious fire at school on Auckland's North Shore
Fire damaged a changing shed separate from the main buildings.
Kettle caused fatal Waimate fire - coroner's findings
Tika and Tika Kafle and their 8-year-old son Prem died in a house fire in 2015.
Apartment owner 'disgusted' controversial cladding not yet removed
City Garden Apartments is one of 25 Auckland buildings with cladding like Grenfell Tower.
Emergency services at house fire in Bayview, Auckland.
Fire crews are at a house fire in Bayview, Auckland, this afternoon.
Couple who lost everything in house fire due to have baby
Couple loses all their belongings in a fire just days before their first child is due.
Fatal fire: 'So fast, I can't imagine how anyone could escape'
Neighbours anxious to learn the cause of the fire after turning off all their heaters.
Fatal house fire in Mangere Bridge
Seven fire appliances and three ambulances at fatal house fire in Mangere Bridge.
'They just started it up and basically, it ignited'
A car fire is thought to have started after the wrong gas was used to fill the fuel tank.
One dead in suspicious house fire, police investigating
Police are investigating a fatal house fire and say the death is unexplained.
Firefighter extinguishes blazing car fire in Queenstown
Firefighter extinguishes blazing car fire in Queenstown. / James Allan
One dead in house fire near Tauranga
Fire broke out about 4.30am and engulfed an upper room in the two-storey house.
Person suffers burns in gas-bottle incident
Ambulance officers attend to person's burns after gas-bottle incident.
Heater sales soar as first chill of winter bites
Searches and sales on heating ballooned as the first real chill of winter started to bite.
Fire crews working to extinguish fire in Woodend
Fifteen firefighters are still at the scene fighting the blaze on Panckhurst Drive.
Bastion Point and the tragedy that nearly ended the protest
Today marks 40 years since the police forcibly ended the Bastion Point occupation.
Accused arsonists appear in court over 15 fires
Two alleged arsonists were terrorising South Auckland with a spate of fires.
Six fire crews respond to Blenheim sawmill blaze
Blaze in hopper at Blenheim sawmill requires "large manpower operation".
Coroner praises heroes in triple fatal party blaze
Coroner praises "selfless and courageous" heroes who saved lives in fatal blaze.
Fire threatens Rakaia River forest
Ten firefighting crews with six water tankers are battling a blaze near Methven.
Fire crews are at a house fire in Onewhero
Fire crews are at a property in Onewhero, where a fire broke out early this evening.
Revealed: Smoke alarms so poor Consumer NZ says they shouldn't be sold
Photoelectric alarms were found to be better at detecting smouldering fires.
Johnson family's house damaged after fire
The Johnson family's house was left damaged after a fire. / Dean Purcell
Former Hamilton strip joint goes up in flames
Fire began at the rear of Calendar Girls, where homeless people had been sleeping.