A suspicious fire at Rotorua Lake High School last night destroyed a classroom and came close to other buildings, including the school's marae.
The fire is being treated as suspicious because the same classroom was set alight a week ago.
Senior station officer Richard Anastasi said the standalone classroom was well alight by the time firefighters arrived, soon after 8.30pm.
He said there was nothing they could do to save it so they concentrated on trying to keep the flames away from adjacent buildings, about 3m away.
It took eight firefighters about 15 minutes to get the blaze under control.