Categorised under four heads, namely, number of terror or insurgent-related incidents, civilians killed by terrorists in violence, security forces (SFS) killed by terrorists and terrorists killed, the government data covering a period of 25 years i.e. from 1990 to 2015, shows that in 1990, there were 4158 incidents of terrorist-related violence in which 461 civilians, 155 security force personnel and 550 terrorists were killed.