mumbai blaze build construction suburb indian city mumbai kill least six people laborers injure nearly dozen fire police officials say thursday cause fire break late wednesday investigate fire service officer say likely compound concern safety financial hub old build collapse last week kill 34 people laborers work build live grind floor families cook gas canisters believe explode fire fuel spread though fire bring control immediately injuries deaths occur arrival fire brigade say p.s rahangdale chief officer mumbai fire brigade eleven people injure eight critically say mumbai endure torrential monsoon rain serious flood recent weeks build collapse last week congest neighborhood old city two days intense downpours fire build india 's mumbai kill least six