A rescue official said the search and rescue operation went on non-stop as part of efforts to find survivors still trapped.Over 100 survivors had so far been pulled out by rescuers from the rubble of Rajpoot Polyester polythene bag factory which collapsed in the Sundar Industrial Estate area Quadrant Enclosures Shower Enclosures on Wednesday during its expansion work.It was unclear how many people were in the building when it collapsed or how many — dead or alive — may still be trapped, but officials have said at least 150 people were in the factory when it came down, a rescue official said.

Officials feared that between 35 to 40 persons may still be trapped under the wreckage of the factory. Injured survivors said Ashraf, who was adding a new floor to the building, had ignored advice from his contractor to stop construction after cracks in the walls following a powerful earthquake on October 26.Factory owner Rana Ashraf was also killed.The death toll in the collapse of a four-storey factory here rose to 31 as six more bodies were recovered on Friday from the rubble of the building, officials said.Noting that the focus of the operation was on the search for survivors, a top administration official said that over 100 people had been rescued.“31 bodies have now been recovered by rescue crews using heavy construction machinery and other tools to dig through the debris,” a rescue official was quoted as saying by Geo TV..He said rescuers were using audio and video technology during the search operation.