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Report: Tons of rock, sand piled on bridge just before collapse

  • Story Highlights
  • I-35W bridge in Minneapolis collapsed on August 1, 2007, killing 13 people
  • Construction material was piled on weakest parts of bridge, investigators say
  • Connectors on bridge called gusset plates were too thin, probe finds
  • National Transportation Safety Board says new info may explain thin gusset plates
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