More than 200 workers believed to be in building as it collapsed.
Casey Kauffman, Al Jazeera’s reporter in Dhaka, said: “The workers were massing rubble on a certain part of the roof as they were knocking down the top of the building.
“The rubble made the roof collapse … and [it] went crashing from the eighteenth-floor all the way down to the fifth or sixth floor, trapping some of those 30 workers inside.”