In Arunachal Pradesh, at least 11 persons are feared killed when the Tata Sumo they were travelling in, plunged down a deep gorge in Balukpong area in West Kameng district around 10.30 this morning. Two other injured passengers have been rescued. Reports said, one body has been recovered while search for the remaining 10 persons is on. The Sumo was on its way from Tawang to Tejpur in Assam when the mishap took place. The accident occurred when the brakes of the vehicle failed.