Security forces on Tuesday ended search operation in Sirsinai area of Swat, however, curfew remained in force in the area. Meanwhile, 12 school children have gone missing in Tehsil Matta, according to reports. According to sources, at least 20 militants and 10 troops were killed during nine-day search operation in Sirsinai and its adjoining areas in Tehsil Kabbal. While dead body of a policemen abducted from Alam Gunj area yesterday was found. Unknown gunmen shot dead one person and injured six others in Malik Abad area situated in the outskirts of Mangora. Security forces' gunship helicopters are doing aerial surveillance in various areas of Swat.