The National Transportation Safety Board is urging Louisiana's transportation department to assess the safety of eight of its bridges, including almost all of the bridges crossing the Mississippi River in the state.

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.

On Thursday, the National Transportation Safety Board revealed the Maryland Transportation Authority missed a critical Key Bridge vulnerability assessment before the collapse.