At least two persons were shot dead while two others received bullet injuries in different areas of the city on Tuesday.
According to police sources, a man was shot dead in a firing incident near an airport signal.
In another incident, Tauqir Hasan, 28, was gunned down in Gulshan-e-Bahar area of Orangi Town.
Earlier, aerial firing was reported in Lasbela that caused tension in the area. Some miscreants set a motorcycle on fire.
Other areas where vehicles were torched and damaged include Shah Faisal Colony, Mazar-e-Quaid and Gulistan-e-Jauhar.
Patel Para, Nazimabad, Gulbahar, Soldier Bazar, Incholi, Abul Hasan Isphani Road, Malir and some other areas also remained in the grip of panic and tension.