Fog Blog U.S. News Log:

DISASTER IN MIAMI! PREFAB SECTIONED PEDWAY CONNECTING PARTS OF THE UNIVERSITY TO THE MAIN CAMPUS COLLAPSED! IT TOOK 6 HOURS ON A SATURDAY TO PUT IT IN PLACE, COULD BE DESIGN FLAW!....Workers continued clearing rubble from the catastrophic collapse of a Miami footbridge on Friday as federal investigators prepared to find out what went wrong — and whether a deadly design flaw or human error was to blame.Robert Sumwalt, chairman of the National Transportation Safety Board, said a 15-member team of experts in civil engineering, materials science and human factors would begin trying to determine "what happened so we can keep it from happening again."Officials declined to speculate on a cause after Miami-Dade Mayor Carlos Giménez raised the possibility that a "stress test" of the 950-ton bridge section was underway Thursday afternoon when the structure pancaked onto at least eight cars on the roadway below.Civil engineering experts say NTSB investigators and forensic engineers will have their hands full with several tasks, including reviewing the drawings of the bridge and corresponding calculations, and looking at how much concrete was used to support the cables. The bridge was built over a multilane roadway and was meant to connect the campus of Florida International University, in Miami, to the city of Sweetwater, where about 4,000 students live."I believe it will be found that it will not be just one thing that happened — it almost never is," said Ralph Verrastro, a principal of Florida-based Bridging Solutions and a specialty structural engineer for more than 500 bridges across the United States.The bridge section that collapsed is designed to hold its own weight until the entire span is assembled into place, Verrastro said. It was built under a method called accelerated bridge construction, which FIU helped to popularize beginning in 2010 but has been around in some form for about 30 years.