A National Investigation Agency (NIA) special court here has sentenced two NDFB(S) militants to death and awarded life imprisonment to two others of the same outfit for killing six persons four years ago in Sonitpur district of Assam.

This is the first instance of any militant being sentenced to death in Assam.

NIA special judge Mahmud Ahmed on Saturday described the case to be the rarest of rare and sentenced Bishnu Narzary and Ajoy Basumatary to be hanged to death.

The judge also sentenced Sanju Bordoloi and Nitul Daimary to life imprisonment.

The judge in his ruling said the injured, as well as the next of kin of the deceased, must be monetarily compensated and referred the matter to the Secretary of the District Legal Services, Kamrup (Metro) to quantify the compensation amount.

The NIA court had convicted the four militants on August 29 and announced the quantum of punishment yesterday.

Six persons were killed and two others injured by a group of NDFB(S) militants who fired indiscriminately at villagers at Santipur village in Dhekiajuli town of the district on December 23, 2014.