The incident occurred when sea waves overpowered Moazzam, 31, and Alam, 61, prompting four other family members to rescue them, but they also became victims to the high tides.
Rescuers made immense efforts to recover bodies of Moazzam, Badar, Talha and Bilal, and said two more of the family, including Mairaj, were missing.
Speaking to The Express Tribune, ASP Bilal Qayyum confirmed the incident, adding a search operation for the missing ones was underway.
Read: Siblings drown in Karachi's Hawkes Bay
The bodies were taken to the Jinnah Postgraduate Medical Centre and later handed over to the family for burial.
In a similar incident on June 13 two siblings were drowned when they ventured into the sea near Hawkes Bay in Karachi, Express News reported.
Swimming or stepping into the sea in Karachi had been banned for six months in August last year after nearly 40 people drowned at Karachi's Sea View on July 31.
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