Federal investigators on Saturday vowed to put a collapsed bridge in a Pittsburgh park “under a microscope" as they examine evidence, including video from a municipal bus that plummeted along the span, prompting rescuers to rappel down a ravine and form a human chain to reach a few occupants.
Five vehicles were on the bridge along with the bus at the time of Friday's predawn collapse in Frick Park. City officials said 10 people, including some first responders, were evaluated and treated for minor injuries, and three people were taken to local hospitals with injuries that were not life-threatening. The collapse ruptured gas lines that ran along the bridge, causing a large gas leak and the subsequent evacuation of several families from their homes.
