The Bodos are an ethno-linguistic community native to the Brahmaputra Valley in Assam state of India. In the mid-1980s, Bodo politicians, alleging discrimination against Bodos in Assam, intensified their campaign for the creation of Bodo-majority Bodoland. While majority of the Bodos envisaged Bodoland as an autonomous territory or state within India, a small section demanded complete sovereignty. NDFB was formed by secessionist Bodos on 3 October 1986 as the Bodo Security Force (BdSF), under the leadership of Ranjan Daimary, in Odla Khasibari village (near Udalguri). BdSF carried out several violent attacks against non-Bodo civilians. On 12 December 1992, it attacked the 7th Assam Police Battalion headquarters at Choraikhola in Kokrajahar district, and decamped with 160 self-loading rifles (SLR) and 5 light machine guns (LMG).