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.

The safety board issued recommendations as part of its ongoing investigation into the collapse of Baltimore’s Key Bridge last year after it was hit by a ship.

Nearly a year since the catastrophic collapse of the Francis Scott Key Bridge after a container ship struck one of its piers, the National Transportation Safety Board is recommending that the owners of nearly 70 bridges across the United States conduct vulnerability assessments of the risk of collapse from a vessel collision.