NDFB traces its origin to Bodo Security Force, a militant group formed in 1986. The current name was adopted in 1994, after the group rejected Bodo Accord signed between the Government of India and ABSU-BPAC. The group has carried out several attacks in Assam, targeting non-Bodo civilians as well as the security forces. In particular, it has targeted Santhal, Munda and Oraon adivasis (tribals), whose ancestors had been brought to Assam as tea labourers during British Raj. Its involvement in attacks on Adivasis during Bodo-Adivasi ethnic clash during the 1996 Assam Legislative Assembly elections led to the formation of Adivasi Cobra Force, a rival militant group. After 1996, NDFB was also involved in conflicts with the militant group Bodo Liberation Tigers Force (which surrendered in 2003). Since 2000, NDFB has increasingly targeted Bangladeshi migrants in what it claims to be the Boro territory.