New Delhi, May 5 -- The Municipal Corporation of Delhi (MCD) has launched an investigation into alleged building bylaw violations linked to the Vivek Vihar fire tragedy that claimed nine lives on Sunday morning, mayor Parwesh Wahi said on Monday. "I have ordered an investigation, and we are looking into the matter and will take action against erring officials if any violation is found in the approval of the building plan," Wahi said, adding that a site inspection has already been carried out. The blaze broke out around 3.30am on the second floor, likely triggered by an AC explosion or a short circuit, and quickly spread upwards. Nine people - four men, four women and a toddler from three families - were killed. At least three were injured, ...