Abdur Razzak Khan worked as consultant when the owner of the eight-story Rana Plaza in suburban Savar illegally added three floors atop the ill-fated building, a police official told newsmen.
63 more bodies were today retrieved from the debris 10th day into the collapse while the number of people rescued alive remained unchanged at 2,437.
"Sixty three more bodies were retrieved from under the rubble (and) the number of rescued people remained unchanged at 2,437 as you cannot expect anyone to survive under the debris at this point," an army spokesman told PTI.
Police said they arrested Khan who earlier warned the commercial buildings exposure to risks for negligence in duty.
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"He (Khan) warned that the building was unsafe ahead of its collapse but he worked as the construction consult when the Rana Plaza's owner illegally added three floors atop his five-story building," the police official said.
Officials earlier said the building was initially erected as a commercial structure to house offices and shops but later it was turned into a industrial unit where five garments factories were set up also installing heavy generators.
An official investigation report said the building was exposed to risks because of the faulty construction methods and use of low category materials while the tragedy was accelerated due to vibrations of the heavy generators while cracks were already developed.