When some inhabitants, who had abandoned their huts due to ethnic clashes, returned to take stock of cattle and other possessions at Dibal Wasling Dimasa village, they were fired upon by suspected Zemi Naga tribes and their houses set ablaze, police said.
A Dimasa villager went missing thereafter, but others managed to escape, they said.
Police said at least 21 houses in the village were gutted in the arson.
The attack appears to be in retaliation to the killing of 15 Zemi Naga tribals, including eight children, and burning down of more than 50 houses at Mechidui, about 23 km from the district headquarters of Haflong, on June 16, they said.
Earlier on June eight and June 10, two Dimasa-inhabitated villages were attacked by suspected Zemi Nagas where nearly 50 houses were set ablaze.
Several persons have been killed in the ongoing clash between the rival Dimasa and Zemi Naga tribes since April last.