It was the sort of scene that plays out thousands of times a day across Mexico City: A tanker truck laden with propane rumbled down a crowded street, pulled up at a hospital and began to pump gas into its storage tanks.
Then something went very wrong. A gas leak led to an explosion Thursday that destroyed a maternity hospital, killing at least three people and injuring more than 70. It's already focusing on attention on Mexico City's unusual reliance on trucking gas through often-chaotic traffic to reach homes and ...
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