
NTSB investigators seek clues after Pittsburgh bridge collapse
CNN
National Transportation Safety Board investigators descended into a wooded ravine in Pittsburgh Saturday where a snow-covered bridge collapsed one day earlier.
Investigators also flew a drone over the area in search of answers as to why the 52-year-old steel frame bridge collapsed in the predawn darkness Friday, leaving 10 people with what authorities said were non-life-threatening injuries.
The NTSB investigation will examine the full history of the bridge, including design, construction, and maintenance, NTSB chairwoman Jennifer Homendy said.
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