PESHAWAR (APP) - At least six terrorists were killed including leader of a local extremist group, while three paramilitary troops got injured in three different incidents of exchange of fire with the security forces in Swat district, official said. Of the six ultras mowed down also included three who were released by the forces three days back after they were found innocent during the trial conducted by the police. Leader of a local extremist group was killed by the forces in Shamozai area of Swat district. Two terrorists were killed in exchange of fire that took place in scenic Utror area of Kalam when challenged by the forces at a check point. Zarqavi and Noorul Hadi were killed as they opened firing at the forces. Two soldiers injured in the shootout. In another activity three terrorists were shot dead after they attacked a military convoy in Sardan area of Peochar valley, Matta tehsil of Swat district of whom one was identified as Waqar. One troop was injured in the attack.