White supremacists, anti-government extremists, radical Islamist
extremists, and other ideologically inspired domestic violent extremists
have been active in the United States for decades. Examples of attacks
include the 1993 World Trade Center bombing by radical Islamists, in
which 6 persons were killed; and the 1995 Oklahoma City bombing of the
Alfred P. Murrah federal building by anti-government far right individuals,
in which 168 lives were lost. The September 11, 2001, attacks account for
the largest number of fatalities in the United States in a single or closelyrelated
attack resulting from violent extremism in recent decades. While
the September 11, 2001, attacks were perpetrated by foreign violent
extremists, from September 12, 2001 through December 31, 2016,
attacks by domestic or “homegrown” violent extremists in the United
States resulted in 225 fatalities, according to the ECDB.
Of these, 106
were killed by far right violent extremists in 62 separate incidents, and
119 were victims of radical Islamist violent extremists in 23 separate
incidents. Figure 1 shows the locations and number of fatalities involved
in these incidents. A detailed list of the incidents can be found in appendix
II. According to the ECDB, activities of far left wing violent extremist
groups did not result in any fatalities during this period.
The source is our government.
read the whole report here
https://www.gao.gov/assets/690/683984.pdf