Determining the Cause of the Bridge Collapse May Take Several Months - NBC Right Now/KNDO/KNDU Tri-Cities, Yakima, WA |

Determining the Cause of the Bridge Collapse May Take Several Months

Investigators have begun the process of determining what caused a highway bridge in Minnesota to collapse on Wednesday. Meanwhile, divers and rescue workers are still trying to determine how many people perished in the tragedy.

The NTSB has asked individuals with home video or photographs to turn them over to authorities to help with the investigation.

On the night of the disaster, there were fears that dozens might have died. But that potential diminished considerably Friday morning, as the number of missing was revised downward from 30 to 8.

The search effort will have to proceede slowly as divers face conditions that are even more treacherous than earlier in the week. 

As far as what caused the bridge collapse, NTSB Chief Mark Rosenker says he hears the reports that some had been casting a wary eye on the condition of this bridge for years, but that he's jumping to no conclusions

Rosenker went on to explain, "We take a look at the clues, we bring all the facts together, we do the analysis, and from the analysis we determine what happened. Unfortunately it takes a long time to do this." 

Rosenker predicts that the process could take as long as 18 months.

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