![A Pittsburgh Port Authority bus that was on a bridge when it collapsed Friday is visible in the city's East End.](https://abc17news.b-cdn.net/abc17news.com/2022/01/hypatia-h_9dc4c96d81c7ca7ba29481b0b770d01a-h_58e33035938d568bd823fff6ec8770df-300-375x225.jpg)
NTSB investigators seek clues after Pittsburgh bridge collapse
By Ray Sanchez and Athena Jones, 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
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