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About 170 firefighters took four hours to extinguish a fire that largely destroyed commercial structures housing a marijuana grow operation in South Los Angeles Saturday afternoon, officials said.

The fire at 8730 Crocker St. in the Green Meadows neighborhood in South L.A. was first reported around 2:20 p.m. as an outside fire to the rear of a one-story commercial building, according to a Los Angeles Fire Department alert.

By 2:45 p.m., the fire dubbed “87th Place Fire” had escalated to a “major emergency” incident as flames entered the structure, at first described as a housing furniture manufacturing business.

Fire officials said the location “at first appeared to be solely an expansive furniture manufacturing business, but also now appears to have housed a marijuana grow operation.”

By 6:23 p.m., firefighters had extinguished the “stubborn” fire, LAFD officials said.

A series of commercial structures with a common roof were largely destroyed in the fire. It’s unclear whether other businesses operated at the location.

Videos showed thick smoke over the area as firefighters responded to the fire.

It’s unclear what sparked the blaze. Officials said the cause of the fire remains under investigation .

No injuries were reported and no further details were available.