About 10.30pm on Monday, December 5, emergency services responded to reports of a fire at a school on Maxwell Avenue, Orange.

Fire and Rescue NSW extinguished the blaze, which caused extensive damage - estimated to be worth $3 million - to the school's library and administration block.

Officers from Central West Police District established a crime scene and started an investigation into the circumstances of the fire.

Following extensive inquiries, detectives said they attended a home in Orange on Tuesday, December 20, and arrested a 12-year-old boy. He was charged and remains before the courts.

Following further inquiries, police say a 13-year-old boy was arrested at a home in Orange on Thursday, December 22.

He was taken to Orange Police Station where he was charged with damage/destroy property by fire in company and aggravated break and enter commit serious indictable offence.

The boy was refused bail to appear in Orange Children's Court on Friday, December 23.

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