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Hear Structural Engineer Mark Ketchum Describe the Forensics Involved in Investigating the Collapse

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Bridge Collapse Will Be Probed Piece by Piece

U.S.

Bridge Collapse Will Be Probed Piece by Piece

Hear Structural Engineer Mark Ketchum Describe the Forensics Involved in Investigating the Collapse

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To unravel the mystery of Wednesday's Minneapolis bridge collapse, investigators will map out where pieces of the bridge are found, inspect those pieces for patterns of stress fractures and send some pieces to labs for tests. Structural engineer Mark Ketchum describes the forensics involved in a conversation with Melissa Block.