Bridge collapses, drops city bus into Pittsburgh ravine-

Bridge collapses, drops city bus into Pittsburgh ravine-

[ad_1] By PTI PITTSBURGH: A 50-year-old bridge collapsed in Pittsburgh early Friday, requiring rescuers to rappel nearly 150 feet (46 meters) and form a human chain to reach occupants of a bus that had plummeted with the span into a park ravine. The collapse came...