A fire broke out in the unit following the explosion which was reported at around 2am in the industrial unit in Andheri, they added. Four fire engines and three ambulances were rushed to the spot, the official said, adding that eight persons, who were injured, were rushed to Rajawari hospital, where five were declared dead.
The exact cause was not yet clear but officials suspect it might be due to a cylinder blast. Further details are awaited. (PTI)