Security forces launched a final assault on terrorists hiding in a building in Karan Nagar area for the last 24 hours, killing an unidentified militant, police said. The identity and group affiliation of the slain militant is yet to be ascertained, a police official said. The operation is going on as security forces believe one more militant is hiding in the under-construction building.Watch One terrorist killed in ongoing Srinagar encounter: Police With HD Quality.