He said in a statement that rescuers also recovered two survivors who were taken to a local hospital. Assiut is located about 400 kilometers south of the capital Cairo.
The governor added that authorities had evacuated surrounding apartment buildings and sent bulldozers and other equipment to clear and secure the site.
Footage shared by the governor’s office appeared to show rescuers attempting to remove the debris and working through the ruins of the building.
As of Sunday afternoon, rescue teams were still searching for survivors using bulldozers and diggers to lift debris.
The Assiut collapse came a day after the roof of a building in the Mediterranean city of Alexandria collapsed, killing two people and injuring one.
In recent years, after decades of lax enforcement, the government has tried to crack down on illegal construction. Authorities are also building new towns and neighborhoods to house people living in high-risk areas.
But many Egyptian cities still contain entire neighborhoods of unlicensed apartment blocks and slums that don’t follow building codes and regulations.