An architect whose firm designed the initial floors of the building said Sunday it had not been designed for heavy industrial work. Masood Reza, an architect with Vastukalpa Consultants, said they designed the building in 2004 as a shopping mall and not for industrial purposes.
Officials say Rana illegally added three floors and allowed the garment factories to install generators. Vibrations from garment machines and from the generators were thought to have contributed to the collapse.
The disaster is the worst ever in the garment sector, surpassing the 1911 garment disaster in New York's Triangle Shirtwaist factory, which killed 146 workers, and more recent tragedies such as a 2012 fire that killed about 260 people in Pakistan and one in Bangladesh that killed 112, also in 2012.