The night-super bus from Guwahati was on its way to Hailakandi when it fell into the about 100-ft deep gorge at Tongseng village near Sonapur around 1:30 am, Superintendent of Police Spill Thamar told PTI.
He said 10 male passengers died on the spot. The injured included four women.
All the injured were taken to Khliehriat Community Health Centre (CHC), from where they were referred to hospitals in Jowai, the district headquarters of West Jaintia Hills District, and state capital Shillong, Thamar said.
Officials from the district administration of Hailakandi, Assam are already on their way to Tongseng for identification of the deceased, he said.