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As a result, a 35-year-old man, Raees, son of Razaq and an unknown man aged 30 died on the spot.
However, Zahid, 25, son of Shaukat, Saleha, 50, daughter of Ali Muhammad, Rohan, 20, son of Aijaz and Khair Muhammad, 55 were critically injured.
The bodies and injured were shifted to Civil Hospital Karachi.