The team will have to submit its report in seven days.
The JIT will include members of ISI, MI and other security agencies.
Qureshi and his young son were killed in a drive-by shooting in the congested North Nazimabad neighbourhood of Karachi on June 21 – a day which also saw the killing of 13 other people in violence elsewhere in the metropolis.
Mohammad Sajid Qureshi, in his early 50s, and his 27-year-old son were targeted by three gunmen as they left a local mosque, Masjid-e-Huda, after offering Friday prayers in Block-B area of North Nazimabad.
The outlawed Tehreek-e-Taliban Pakistan (TTP) claimed credit for the killings of Sajid Qureshi, a member of the Sindh Assembly, and his son Waqas.
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