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"The stairs leading to the roof were locked, otherwise the labourers could have survived by running to the rooftop," Khan said.

Karachi city administrator Murtaza Wahab also said there was no safe exit for the workers.

Poor industrial laws and building codes in Pakistan mean factory blazes are frequent.

In 2012 at least 250 labourers for a garment factory died in Baldia Town in western Karachi when a fire engulfed the facility and there was no fire escape.

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