Three unidentified militants and a policeman were killed in two separate encounters in Budgam and Shopian districts of Jammu and Kashmir, officials said on Friday. Security forces launched a cordon and search operation in Zanigam village in the Beerwah area of Budgam district following information about the presence of militants there, the officials said. <br /> <br />They said the search operation turned into an encounter after militants opened fire towards security forces' positions. Two policemen were injured in the gunbattle. They were rushed to a hospital here for treatment but one of them succumbed, the officials said.