A Maryland law enforcement official said while there is a "distinct possibility" that there could have been more vehicles on the bridge when it collapsed, they have not found any evidence to support that.
"As unfortunate as it may be, it's a distinct possibility. However, we don't have any information to support that at this point," Maryland State Police Secretary Col. Roland L. Butler Jr. said.
Authorities have been able to find three passenger vehicles, a cement truck and a fifth vehicle submerged in the water using infrared and side-scan sonar technology, Baltimore City Fire Chief James Wallace previously told CNN.
Radio traffic captured how authorities stopped traffic and worked to clear the bridge seconds before the impact.