New Delhi: A massive fire broke out in a cardboard factory at Mayapuri Phase-1 area in the city Saturday morning. Around 30 fire tenders have been pressed into service to douse the blaze which broke out at around 8.20 AM, a fire department official said, adding there was no report of any casualty so far. ,br> By the time fire fighters reached the spot, heavy smoke filled the air, the official said. The reason behind the fire is yet to be ascertained. ,br> "Loss of property estimated to worth lakhs of rupees could not be ruled out," the official said.