MEXICO CITY – Mexican investigators were working to determine the cause of a crash in which a tanker truck carrying more than 13,000 gallons (49,500 liters) of gas exploded on a major highway in the capital, killing at least three people and injuring 70.

The fiery crash Wednesday that burned more than two-dozen vehicles created a gruesome scene of badly burned survivors staggering in the street in tattered clothing as first responders rushed to the scene. The injured suffered second and third-degree burns.

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The tragedy drew renewed attention to the thousands of trucks that rumble through Mexico daily carrying liquid propane, which most homes and businesses rely on for cooking and heating water. Regulators said a preliminary review revealed the truck did not have up-to

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