Two boys messing about with a sparkler set off a fire which caused the evacuation of Rotorua Boys High School.
A teacher doused the flames with a hose before firefighters arrived.
Principal Chris Grinter said the two Year 10 students were spoken to by police and the school would also be making inquiries.
By law, sparklers and other fireworks are not allowed to go on sale until October 27 - 10 days before Guy Fawkes Day.
Sparkler starts fire at Rotorua Boys High
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