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The day after massive dual earthquakes shattered Venezuela, Ailin Quiroz made her way toward the coast to search for her sister. She found only a mountain of rubble where her apartment building had once stood.

Quiroz climbed through the ruins for hours but found no trace of her sister or six other relatives who lived in the 13-story tower. Now, she’s tormented by a question: Why did their building collapse while other nearby high-rises survived?

The building was one of 15 public housing towers in the coastal town of Caraballeda that collapsed in the 7.2 and 7.5 magnitude quakes on June 24.