The police sources said that security forces launched intelligence-guided targeted operation in Hub area after receiving information about presence of alleged chief of banned militant outfit, Jandullah which led to exchange of fire between the security forces and the armed men.
"The security forces cordoned off a house and the armed men hiding in the house opened fire at law enforcement personnel," they said, adding that the security forces also retaliated against the attack.
The law enforcement personnel also arrested an alleged suicide bomber and seized weapons and explosives from the house.
Aarif alias Saqib was behind acts of terrorism including suicide blasts in Karachi and Balochistan, they said.
The law enforcement agencies have launched search operation in the area. Further probe was underway.