SUN VALLEY ( — Police say a commercial building in Sun Valley where a fire erupted Thursday was a marijuana grow house.

The fire was reported around 11:05 p.m. in the building on Glenoaks Boulevard near Sheldon Street, according to officials.

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Flames were seen through the roof of the structure.

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It took firefighters about 20 minutes to knock it down.

No injuries were reported.

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The cause of the fire was unknown.