THIRUVANANTHAPURAM: A massive fire broke out in a three-storey building in Nagaroor in Thiruvananthapuram on Saturday evening. The fire broke out in the building, which also houses a supermarket. The fire first broke out from a gym in the building and later spread to the gas cylinder godown. Efforts are underway to extinguish the fire. More fire force teams have reached the spot. It is reported that there were no casualties in the accident.