Police are investigating the setting of people traps in earthquake damaged homes in the red zone in Christchurch.
A spokesperson said Canterbury Earthquake Recovery Authority staff discovered that someone had attempted to create a hazard for anyone entering a small number of homes.
Police and the authority would not provide details of the hazards.
A spokesperson for the authority said staff regularly check properties in the uninhabitable residential red zone and would continue to do so.
Christchurch's earthquake damaged red zones are almost cleared, but 100 homeowners are now learning what life will be like once everyone else has gone. Video
Preliminary projections by the Christchurch City Council show there will not be enough money to fix damaged roads to pre-earthquake conditions.
Sheep-grazing has been suggested in a report to the Canterbury Earthquake Recovery Authority to control grass and weeds in some areas of red-zoned land in Christchurch.
The Crown was under pressure to give Christchurch residents timely decisions about quake-damaged land in 2011, the Supreme Court has been told.
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