Acting on a tip-off, a contingent of the police and Tripura State Rifles(TSR) co-commandeered by the officer in-charge of the police station and a TSR company Commandant raided last evening a hideout of NLFT extremist at Gobindabari, cordoning it from three sides. When the extremists opened fire the security forces retaliated. The encounter resulted in the killing of a hardcore NLFT extremist, and led to the capture of another. As SLR with magazine, a dagger and several incriminating documents were seized from the deceased militant. On the basis of confessions from the captured militant the jawans proceeded at night on feet and got hold of an extremist camp about 15 k.m. away. The extremists had already made good their escape from the camp leaving behind their cooking utensils and food stock. The jawans burnt down the camp along with all those articles. In another encounter at Kanthaliachhera bazar under the same police station yesterday, on a tip-off, the militants could make good their escape, but the blood stains on their escape route indicated injury inflicted on at least one militant.