Assam has been a witness to waves of migration for centuries resulting in a unique mixture of social and ethnic groups in the region. There have been many instances of friction between the local and migrant communities over land and other resources and the ethnic conflict arising out of movements for statehood, autonomy and language only added to the tensions between the communities.
The Bodo Security Force (Bd.S.F), a militant organization, came into existence under the leadership of Ranjan Daimary in 1986 with a vehement resolution to combat the domination and suppression by the Indian State and it agencies in the post-independent India. The Bd.S.F was later renamed as the National Democratic Front of Bodoland (NDFB) in 1994. While the Bodo Liberation Tiger (BLT), another armed group which demanded a separate state for the Bodos to be carved out of Assam but gave up arms and joined mainstream politics later, the NDFB outfit's continued with its armed struggle for a sovereign Bodoland.