At least eight militants were killed and 11 others injured in a clash between security forces and militants in Orakzai Agency, a private TV reported Sunday. According to official sources, militants attacked a security forces check post in Go-in area of lower Orakzai agency. The militants used rocket launchers and machine guns and in retaliation security officials killed eight of them and injured 11. Three militants hideouts were also destroyed in the process. On Saturday, 19 militants were killed in clashes in lower Orakzai. Military operation against militants is underway in Orakzai agency since the past four weeks. Security forces have cleared most of the area of lower Orakzai and have destroyed dozens of militants bases while arresting another dozen. Forces are now advancing towards the central Orakzai agency. It should be mentioned that the Orakzai Agency operation is underway for a month now and over 400 extremists have been killed thus far.