Clifton police arrested six people after the incident.
The restaurant is owned by PML-N leader Sardar Raheem.
Four other people were killed in different firing incidents across Karachi.
A security guard was shot dead when he tried to prevent an armed man from stealing a motorcycle in Defence area.
In Kharadar area, two brothers were fired at, out of which one died while on his way to the hospital.
In a separate incident of target killing, a man was gunned down by unidentified motorcyclists on Maripur road.
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