VAN NUYS (CBSLA.com) — Crews on Thursday extinguished a fire that erupted within a warehouse in Van Nuys.

Shortly after midnight, firefighters were sent to the 14900 block of Calvert Street near Kester Avenue for report of a commercial fire, according to the Los Angeles County Fire Department.

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Upon their arrival, authorities located smoke showing from reThink Environmental, a business that produces lighting, energy and surfacing products, located within a one-story warehouse building.

Firefighters said flames quickly spread to a second business, KCK Industries, which provides health care and hygiene products.

In total, 161 firefighters extinguished the blaze within just over two hours.

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One firefighter was treated at the scene for heat exhaustion.

No other injuries were reported.

Monetary loss is still being evaluated.

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The cause of the fire remains under investigation.