The building collapsed on Sunday and it was unclear how many people were inside at the time. It had 40 apartments and most of them were empty because it was recently ordered vacated after it was declared unsafe in March.
While talking to local media, provincial health secretary rejects claims that any one has died from heat-stroke in Pakistan's largest city.
According to local media, most of those killed were electrocuted. The army has stepped in to aid with rescue and relief efforts in the massive city.
Abdul Sattar Edhi, the founder of one of Pakistan's biggest charity organisations, the Edhi Foundation, died at the age of 88 in Karachi.
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