The victims, who were aged between 10 to 14 years, were found in a house in Mirajul Nabi Colony.
Locals had informed the police about the house when it had been shut for more than three days.
An eyewitness claimed that the girls were drowned.
The sisters, 15-year-old Uzma, 12-year-old Sumaira, and eight-year-old Nisha, were the eldest among four sisters and three brothers. Two of the sisters, Uzma and Sumaira, suffered from polio and were disabled since birth.
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