According to initial reports, two to three workers fell into the tank after opened its cap to inspect a suspicious smell. In a bid to rescue them, more labourers plunged in.
However, the exact cause of the incident is being investigated.
Read: 258 dead in Karachi garment factory fire
Bodies of six men were taken out of the tank under supervision of local police, and rescue officials, whereas one of the workers miraculously survived. He has been shifted to the Jinnah Hospital.
Factory owner Mehtab is also believed to be one of the deceased, while most of the other victims are said to be his relatives. All victims were residents of Dehli colony.
Read: Quality standards: Factory sealed, spurious medicine seized
The factory is illegally located in Darus Salam Housing Society, a residential area in Korangi.
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