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.

READ MORE: San Jose Becomes First US City To Require Liability Insurance For Gun Owners

Flames were seen through the roof of the structure.

READ MORE: Laguna Hills High Student Spouts Racial Slurs At Black Player During Basketball Game

It took firefighters about 20 minutes to knock it down.

No injuries were reported.

MORE NEWS: Kobe Bryant Remembered On 2-Year Anniversary Of His Death

The cause of the fire was unknown.