A senior police official was killed and three others injured when two motorcycles collided here on Wednesday. According to the police, the accident took place in Murtazabad area of Hunza Nagar in Gilgit-Baltistan (GB) where two over-speeding motorcycles collided head-on. As a result of collision, Station House Office (SHO) Nasirabad was killed on the spot while three others sustained wounds. The body and injured were shifted to hospital for medico-legal requirements.