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.
Images show scene of Pittsburgh bridge collapse 01:24The 13-member NTSB team arrived on the scene late Friday afternoon.Homendy said structural and material engineers would map out the area with a drone before removing debris and other evidence. The engineers will look for signs of stress in the materials that made up the bridge as well as fractures and deterioration, according to NTSB investigator-in-charge Dennis Collins. 'use strict';CNN.Videx=CNN.Videx || {};CNN.Videx.mobile={};CNN.
'I'm speechless': Pennsylvania Lt. Gov. reacts to bridge collapse 01:55Four vehicles were on the bridge when it fell in the area of Forbes and Braddock avenues, authorities said. First responders used ropes to rappel down to get to the victims, Fire Chief Darryl Jones said. Crews also used what he called a"daisy chain" where they linked hands to reach the victims and pull them out.
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