Transport ministry inspectors received 27 reports of accidents involving small unmanned aircraft, or drones, last year, according to a new report.
In 2013 there were 15 accidents and in 2012 just eight, the ministry says. Most of the incidents were reported by manned aircraft and professional drone users.
The true figure is likely to be far higher because not all incidents are reported, the NRC points out.
In total, 11 incidents last year involved a crash landing close to people or buildings
New rules governing the use of drones come into effect later this year.
A mini drone will not be allowed to fly higher than 50 metres or 100 metres from the controller.
Drones will also have to keep a distance of 50 metres from people, buildings and other unmanned aircraft. Nor can drones be flown within five kilometres of airports.
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