SUN VALLEY (CBSLA.com) — 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.

Flames were seen through the roof of the structure.

It took firefighters about 20 minutes to knock it down.

No injuries were reported.

The cause of the fire was unknown.

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