way. >> we have a report of several people injured at this time. >> reporter: authorities announced the frantic effort to rescue people trapped in the rubble is now a recovery operation. >> the cars were completely crushed under. you could see the front of the car and a lot of debris everywhere. >> reporter: emergency crews working desperately into the night to recover victims in eight flattened vehicles. using search and rescue dogs to look for signs of life. >> we want to do our best to find out what happened here and if anything has done anything wrong, we will hold them accountable. >> reporter: the 950-ton bridge was to give people a safe way to cross the busy highway below after the death of a student last year. >> being under the bridge we were like, oh, this is so scary. because it weighs so much. but we had trust that the people who built it, there was no fault or anything. >> reporter: the structure was just installed last saturday.