Three workers were killed in afire that broke out on the third floor of a garment label manufacturing factory in Ahmedabad on Saturday, an official said.The factory, identified as Lotus Label Industries, is located in Odhav GIDC in Ahmedabad."Threeworkers were asphyxiatedto death in a fire which broke out on the third floor of a garment label making factory that storedrayon fibre," said MF Dastoor, Ahmedabad Municipal Corporation's Chief Fire Officer."The labourers were working in a room adjacent to the third floor of the factory where the fire broke out. They died from asphyxiation as the room had no window or ventilation," Dastoor said.He said a cylinder kept in the room blew up in the fire while another was brought out safely."The fire broke out at 3:30pm and three fire tenders and five tankers took three hours to douse it. The cause of the blaze is yet to be ascertained," Dastoor said.