The girl Taktaylay Jeme had gone to a weekly market when she was shot dead by four Dimasa attackers in the heart of the district headquarter Haflong town at 12.30 pm, police said
The killing in broad daylight has created a sensation in the township with several social organisation condemning the murder.
Police has launched a massive manhunt to nab the assalaints.
The ethnic violence between warring Dimasa and Zeme Naga tribal communities have claimed nearly 100 lives in the last three months during which hundreds of houses have been torched.