Updated at 17:10. Revised to contain additional information.
Another part of a parking garage in Irving collapsed on Tuesday afternoon, about five hours after a previous partial collapse.
The area that fell at 16:30 was adjacent to the part that was involved in the initial collapse, KXAS-TV reported (NBC5). Nobody was hurt, firefighters said.
The first collapse occurred just after 11:30 in the 4500 block of Fuller Drive in Las Colinas. Even with this collapse nobody was injured.
A 40-foot-by-40-foot section of the top floor fell to the first floor, shattering 21 cars, according to the Irving Fire Department.
The department said no civilians or first responders were injured after a first search, and no one was found in the rubble after a secondary search involving Dallas Fire Rescue crews and search dogs.