Mexico City — An investigation was underway on Thursday into the cause of a crash in Mexico City in which a tanker truck exploded on a major highway, killing at least six people and injuring 90.

The fire engulfed more than two dozen vehicles and left 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.

The tragedy on Wednesday 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, which was carrying more than 13,000 gallons (49,500 liters) of gas, did not have up-to-date insurance

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