The NTSB has been hearing lots of numbers about how many cars and people were on the bridge during the collapse, National Transportation Safety Board Chair Jennifer Homendy said Tuesday.
Search teams are working to verify those numbers, she said, but it's not for the NTSB to nail them down.
Instead, she said, local authorities like Maryland State Police and the Maryland Transportation Authority along with federal partners will work to verify if there are other victims.
"Nobody is going by a number," Homendy said. "They're looking and they're searching. That's what's important."