Security forces on Monday had apprehended a top Bodo militant, allegedly one of the masterminds of the tribal massacre from a remote village in Assam's Chirang district, officials said.
Following a tip-off, army and police had jointly launched operation at Tukrajhar village in the BTAD district and nabbed the top militant of the National Democratic Front of Bodoland (Sangbijit) faction group.
Defence spokesman based in Guwahati said that, the nabbed militant Sumanta Basumutary alias B Sinaihang is the self styled Joint Secretary, Home of the newly formed central council of the outfit group.
"Sinaihang is a trained member of 42nd batch of NDFB(S) in Bhutan and close with the new vice president of the group G Bidai and is believed to be the brain behind the killing of tribal on December 23, 2014 in Kokrajhar district, " the Defence spokesman said.
"After the tribal massacre he fled to Bangalore and had recently returned to Chirang," the Defence spokesman said.
In 2014, NDFB(S) militants had killed at least 80 Adivasi people in Kokrajhar, Sonitpur and Chirang district.