Fireworks caused 188 fires and injured 12 people last Guy Fawkes, and emergency services are urging New Zealanders to be cautious this year.
Statistics provided to the Herald showed fire crews across the country attended 188 "unnecessary" fires for the month of November which have been blamed on fireworks.
Of those, 19 involved structures and buildings.
St John data showed there were 12 medical emergencies last Guy Fawkes period, four times the number of burns dealt with on average day.