The arrested gangsters included Ubaid, Shakir alias Police Wala, Akram Lasi and Asghar Ali.
Arrested men said to be involved in heinous crimes in the city including terrorism, murder and other crimes.
Moreover, Sachal police station personnel in a late night raid arrested five suspected terrorists.
The accused arrested after an encounter, SSP Malir Rao Anwaar said in a statement.
Two kilogrammes of explosives and arms recovered from the arrested men who said to be wanted to police in attacks on the security forces and the law enforcement agencies.
Police arrested two suspects involved in street crimes in Ittehad Town.
Boat Basin police arrested two members of a gang of robbers and recovered illegal arms and stolen valuables from their possession, police sources said.