MEXICO CITY (AP) — A gas tanker truck exploded under a highway overpass in Mexico City Wednesday, sending flames and smoke billowing into the air, burning more than a dozen cars and injuring 57 people, the city’s mayor said.

Mayor Clara Brugada called the explosion an “emergency” that left 19 people with grave injuries, but said no one had yet died from their injuries. The 57 injured were taken to hospitals across the city.

Brugada said prosecutors were investigating the incident, but it appeared that 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 appear

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