On Monday, Johannesburg emergency services retrieved three bodies from the remains of the Power Park building behind the Orlando towers, which collapsed in late June.
This brings the number of bodies found at the site to seven, Sapa reported.
The SABC reported on Tuesday that officials believe there could be more bodies under the rubble, and are on standby.
An official said the building was large and there was a lot of rubble. Teams are working at the site.
According to earlier reports, the building collapsed as a group of people were allegedly trying to remove cables and metal from the structure.