They were identified as Zubair, Aman, Abdullah, and brothers, Aseed and Maqsood.
According to police and rescue workers, the children had been playing on the site of an under-construction building and jumped into the nearby pit to cool off.
Their bodies were recovered by rescue workers, and shifted to a local hospital for medico-legal formalities.
Area residents have accused the builders and officials of the Karachi Water and Sewerage Board of negligence.
They claimed that it was water from a faulty pipeline that had accumulated in the three to four feet deep pit.
