For 47 years, the Francis Scott Key Bridge stood as the gateway to the Port of Baltimore and a landmark as one of the longest steel truss bridges in the world.

Sixty-eight bridges across the US should be assessed to see if they are at risk of collapse if hit by a ship, transportation safety officials found, while urging the bridges’ owners to undertake immediate vulnerability assessments.

Maryland marked one year since the deadly bridge disaster in Baltimore. Now, the NTSB is urging other bridge operators to conduct critical safety checks to avoid another tragedy. FOX's Caroline Shively reports from Baltimore.