BANNING (CBSLA.com) — Firefighters contained a blaze that erupted at Banning High School on Thursday.

According to the Riverside County Fire Department, firefighters were sent shortly after 1 a.m. to the 100 block of West Westward Avenue for report of a fire alarm activation.

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Upon their arrival to the school, crews located smoke showing from the administration building.

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About 18 firefighters were able to extinguish two piles found burning inside the building.

No injuries were reported.

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Investigators believe someone intentionally set fire to the high school.