Three militants were killed in a clash between security forces and militant fighters in Banjer area of tehsil Barikot in Swat. According to sources, the militants opened fire at the troops patrolling in Banjer area injuring a security man. In the counter attack troops killed three militants. Moreover, the forces imposed curfew in Haji Baba, Sharifabad, Khwajaabad, Rang Mohalla and other localities in the vicinity of Mingora and launched a search operation to arrest militants. Several militants have been arrested from various areas, sources said.