Three people have been killed and at least 70 others wounded when a gas tanker truck exploded under a highway overpass in Mexico City, causing widespread damage, according to municipal officials.

The vehicle blew up on a bridge in the densely populated Iztapalapa district in the capital’s east on Wednesday, sending flames and smoke billowing into the surrounding area.

Mexico City Mayor Clara Brugada called the explosion an “emergency” that burned nearly 30 vehicles and left 19 of the injured in grave condition, including the driver of the truck. Among those injured are a baby and a two-year-old child.

Images on television and social media showed the moment of the powerful explosion, the causes of which are not yet known.

People could be seen with what appeared to be serious burns, whil

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