MEXICO CITY — An enormous explosion under a highway overpass in Mexico City killed eight people and injured nearly 100 in all on Wednesday afternoon, Mexican officials said, attributing the blast to a cloud of gas leaking from a truck.

Clara Brugada, the city’s mayor, posted a list on social media of those who were hurt when the inferno erupted, several of whom suffered severe burns. More than 20 people were in critical condition, she said in a news conference Thursday.

According to the list, some of the injured had burns over more than half of their body. Brugada added that at least 10 of the victims had already been discharged from the hospital.

“It is a tragic accident. The prosecutor’s office is beginning investigations to determine what happened,” Brugada said at the scene.

The bl

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