The Fire Service is investigating a fire at a school in north Hokianga.
The Kohukohu fire brigade was alerted to the blaze at Kohukohu Primary School blaze after 5am on Monday.
Northland region fire safety officer Craig Bain says the fire caused extensive damage to the caretaker's shed. Someone had forced their way into the shed through a window.
But the brigade managed to stop the fire from spreading to other school buildings.