Pakistani security forces on Sunday arrested eight militants in an ongoing operation in Azam Warsak area of northwestern tribal agency of South Waziristan. Security sources said that 13 militant and one soldier was also injured during exchange of fire between the forces and the militants. The official sources said that the forces conducted the operation in early morning and repulsed an attack at its fortress in Khankot. Pakistani security forces have been battling in the region since 2008 against the Tehrik-i-Taliban Pakistan led extremist.