Approximately 45 firefighters knocked down a large fire Monday in a vacant two-story commercial building in Fullerton.

Around 1:23 p.m., crewmembers from the Fullerton Fire Department responded to heavy fire and smoke coming from the interior of the building in the 1700 block of West Orangethorpe Avenue. Due to the thick smoke, Orangethorpe Elementary School on nearby Brookhurst Road had to shelter in place.

Deputy Fullerton Fire Chief Jon Fugitt said the fire was successfully knocked down, and damage was isolated to the area of origin. No injuries were reported, and the cause of the fire was under investigation.

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