SOUTH LOS ANGELES (CBSLA.com) — Firefighters extinguished a blaze on Monday that erupted in a commercial building in South Los Angeles.

Shortly before 5:30 a.m., crews were sent to the 5700 block of Holmes Avenue for report of a fire burning within a single story building, according to the Los Angeles Fire Department.

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Upon their arrival, authorities located heavy smoke billowing from the building with flames burning through the attic area.

As firefighters made entry, they discovered a marijuana grow inside.

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About a half hour later, authorities extinguished the fire.

At this time, it remains unclear if the grow operation is illegal.

No injuries were reported.

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The cause of the fire remains under investigation.