The bodies of two people have been recovered from a red pickup truck, which was under water where the Baltimore bridge collapsed.
Eight workers were on the bridge when it was struck by a ship, plunging them into the waters below.
Two were rescued on the day, but the search continues for the other four. All are presumed dead.
Salvage crews are working to address hazardous materials and accident investigators are on the scene.
Four of the six victims of the bridge collapse have been named so far.
Maryland police said the bodies of Alejandro Hernandez Fuentes, 35, and Dorlian Ronial Castillo Cabrera, 26, were recovered from inside the truck. Mr Fuentes is originally from Mexico and Mr Cabrera is from Guatemala.
According to the BBC police said divers are no longer able to navigate the waters safely because of concrete and debris found in the river.