Two youths have been arrested in relation to a fire at Upper Hutt College in September.
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Police said a large section of the school was extrensively damaged in the fire on 1 September.
It caused damages worth about $1.5 million.
In the aftermath of the fire the school was closed for two weeks, causing significant disruption for the community, police said.
They found evidence related to the incident during the execution of two search warrants in Upper Hutt and one in Palmerston North.
Two people were arrested and will appear in Youth Court at a later date.
"Police hope these arrests reassure the community that we are committed to investigating acts of wilful damage and arson thoroughly, and holding those responsible to account."