Faulty support plates contributed to Minnesota bridge collapse , according to officials . Nine were killed , 145 injured in bridge collapse . Substantial increases in the weight of the bridge because of modifications through the years , along with increased weight on the bridge due to construction equipment and rush-hour traffic the day of the collapse , likely contributed to the faulty plates ' collapse , the board said . Residents have filed lawsuits against consulting firm , construction company .
Faulty support plates contributed to Minnesota bridge collapse , according to officials . Nine were killed , 145 injured in bridge collapse . Residents have filed lawsuits against consulting firm , construction company .