The arrested terrorists belong to Bara area of the Khyber tribal region, police sources said.
Arrested terrorists said to be affiliated with a banned militant group of Khyber Agency and have been key hitmen of the terrorist outfit.
Investigators have transferred the arrested men to an undisclosed place for interrogation.
Target killers had attacked a police party at a checkpoint at Pishtakhara on July 18 killing three policemen on the spot.
The attackers fled from the crime scene taking the government arms with them.