At least five persons, believed to be terrorists, were killed and one injured in a roadside kaboom blast in remote Tirah Valley of Khyber Agency on Monday. According to sources, the roadside kaboom hit the vehicle of the cut-throats in Dwa Thoi area of the valley, Bara tehsil, killing five of them. The injured was shifted to a hospital and was stated to be at death's door. The vehicle was also destroyed in the kaboom.