Unknown assailants shot a local councillor named Abdul Qadir Khilji at Thana Road in Quetta, who succumbed to his wounds on way to hospital.
In another firing incident at Barori Road, a man named Mehboob Ali was gunned down, while unidentified men killed Abdul Ghafoor at Eastern Bypass.
A man also shot his 18-year-old son dead in Nawankali, a suburban area of Quetta.
In Mastung, Rehmatullah fell prey to the attackers.
In another shooting in Khuzdar, National Party leaders Attaullah Sajidi and Siddique Samalani were killed.
All the incidents occurred within a span of few hours, while police say that raids are being conducted in search of assailants.