A major fire broke out at a four-storeyed building in West Delhi's Mansarovar Garden, leading to the collapse of the whole complex today. The Delhi Fire Services received a call about a fire at the building that housed a semi-mall at around 3.45 pm. Thirty fire tenders were rushed to control the blaze, a fire service official said. Goods in the shops of the building were gutted but no one was reported to be injured in the fire, he said. During the dousing of the fire, the whole building, weakened by the heat, collapsed, the official said. It took the firefighters over two hours to bring the fire under control. Firefighting operations continued till late night. Police said that the cause of the fire was under investigation but the possibility of an electric short-circuit could not be ruled out.