Faulty support plates led to Minnesota bridge collapse , according to NTSB . An NTSB report released Friday said the board 's investigation found that 24 `` under-designed '' gusset plates were not discovered in reviews during the bridge 's design and construction . Thirteen people killed , 145 injured in bridge collapse . Comment:
Faulty support plates led to Minnesota bridge collapse , according to NTSB . Thirteen people killed , 145 injured in bridge collapse . Comment: