A major fire broke out at a slum in Kolkata's Bagbazar area on Wednesday evening, officials said. At least 24 fire tenders were pressed into service as the blaze engulfed several houses in the slum beside the Bagbazar Women's College near the Chitpore Lock Gate Bridge. Blasts were heard in the slum which are being suspected to be gas cylinders at the houses on fire. There were no reports of any casualty as most of the people were evacuated on time. The blaze also spread to the adjacent Sarada Mayer Bari as the firefighters escorted the saints out. The reason for the fire is not yet known.