MEXICO CITY — A gas tanker truck exploded along a Mexico City highway Wednesday, sending flames and smoke billowing over the south of the capital and injuring at least 57 people, some with their entire bodies charred and others waiting for help in the middle of the road with burns and torn clothing. Mayor Clara Brugada called the explosion under a highway overpass an “emergency” that burned 18 vehicles and left 19 of those injured in grave condition. She said no one had yet died from their injuries, and the wounded were taken to hospitals across the city.

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