Mumbai, July 12 (ANI): After Delhi and Chennai, now a building in Mumbai's Colaba area collapsed on Saturday morning, leaving at least one dead and several injured. It is yet to be ascertained what caused the building to collapse which is located at Ganesh Murti Nagar at Colaba but according to initial reports, the roof of the building caved in. The city has been witnessing incessant rains since past few days.