The Guwahati National Investigation Agency (NIA) has filed a second supplementary charge sheet against the terrorists who had attacked the Adivasi Community in Shantipur village in 2014.
The charge sheet was filed on February 2 in a Special NIA Court.
In the incident that took place on 25 December 2014, the National Democratic Front of Boroland (NDFB) terrorists killed 12 villagers and injured three.
According to the charge sheet, the killings and injuries were caused due to "indiscriminate firing with sophisticated weapons".
The evidence till date has been collected by the NIA on the basis of field investigation as well as technical and forensic reports against the accused persons.
The accused terrorists are still absconding, while further investigation is going on in the matter.