An unidentified terrorist was killed in an encounter with security forces in Shopian district of Jammu and Kashmir on Friday, police said.Security forces launched a cordon and search operation in Turkwangam area of Shopian district in south Kashmir during the night following inputs about the presence of terrorists there, a police official said.He said the search operation turned into an encounter after the militants fired upon the forces, who retaliated.In the ensuing exchange of firing, a militant was killed, the official said.The identity and group affiliation of the slain ultra was being ascertained, the official added.The operation is on, he said.