The National Transportation Safety Board is leading the investigation into the bridge collapse in Baltimore, and today they are interviewing crew members who were on the ship that hit the bridge and collecting evidence. CBS News Reporter Nicole Sganga with more. 

<p>The National Transportation Safety Board is leading the investigation into the bridge collapse in Baltimore, and today they are interviewing crew members who were on the ship that hit the bridge and collecting evidence. CBS News Reporter Nicole Sganga with more. </p>

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