A gas tanker truck has exploded along a Mexico City highway, sending flames and smoke billowing over the south of the capital and injuring at least 57 people.

Mayor Clara Brugada called the explosion under a highway overpass an "emergency" that left 19 of those injured in grave condition and burnt out 18 vehicles. She said no one had yet died from their injuries, and the wounded were taken to hospitals across the city.

Brugada said prosecutors were investigating the incident, but it appeared the truck exploded after it tipped over on the highway.

Images circulated online by authorities showed a mass of flames coming from a truck, while other videos on social media show dozens of people screaming and running from the explosion. The videos show two men whose entire bodies appeared to hav

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