A National Transportation Safety Board official said that the structure of the collapsed Baltimore bridge will be looked into as part of the agency's investigation.
"There's some questions about the structure of the bridge," NTSB chair Jennifer Homendy said.
Homendy said that NTSB is "aware of what a structure should have" and will look into how the Francis Scott Key Bridge was built and investigate the structure itself.
"All of that will be a part of our investigation. We go very broad in our investigation," she said.