In this March 16, 2018 file photo crushed cars are shown under a section of a collapsed pedestrian bridge near Florida International University in the Miami area. A federal workplace safety agency says engineers had knowledge of extensive cracking and failed to order to close a street and shore up a pedestrian bridge before it collapsed and killed six people at a Miami university last year. On Tuesday, June 11, 2019 a report by the U.S. Occupational Safety and Health Administration concluded the size of the cracks warranted the street be shut down immediately.