Atlanta fire crews battled a massive blaze that gutted a MARTA bus in southwest Atlanta on Monday morning.

Details are limited and it’s unclear what sparked the fire, but it was reported around 6:45 a.m. along County Line Road at Campbellton Road, according to the WSB 24-hour Traffic Center. MARTA officials confirmed it was a natural gas bus.

Atlanta firefighters battled a huge fire that destroted a MARTA bus early Monday morning. (John Spink / John.Spink@ajc.com)

Credit: John Spink

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Credit: John Spink

Officials said the bus driver was finishing a route with no passengers aboard when flames started coming from the left rear inside tire. It spread to the rear of the bus and quickly engulfed the rest of it before it was extinguished, leaving behind only its charred framework.

Fire investigators were still at the scene at 8 a.m. inspecting what was left of the bus.

Atlanta fire officials inspect what is left of a MARTA bus that went up in flames early Monday morning. (John Spink / John.Spink@ajc.com)

Credit: John Spink

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Credit: John Spink

No other details have been released by officials.