MEXICO CITY -- Families clustered outside hospitals awaiting word of their loved ones Thursday after the crash and explosion of a tanker truck a day earlier on a Mexico City highway that killed at least eight people and injured 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.

Mexico City Mayor Clara Brugada said Thursday the death toll had risen to eight, with 67 others still hospitalized, 22 of those in critical condition.

The accident 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

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