Centre has extended ban on National Democratic Front of Bodoland (NDFB) along with all its groups, factions and front organisations, by 5 more years.<br />'' <br />'' Ministry of Home Affairs said in a notification that NDFB was involved in killing of 19 civilians in incidents of violence since January 2015.<br />''<br />'' It said, they were also involved in 62 violent incidents since 2015 in which 55 extremists have been killed and 450 extremists have been arrested.<br />''