"In analyzing fatalities from terrorist attacks, religious terrorism has killed the largest number of individuals—3,086 people—primarily due to the attacks on September 11, 2001, which caused 2,977 deaths.10 The magnitude of this death toll fundamentally shaped U.S. counterterrorism policy over the past two decades. In comparison, right-wing terrorist attacks caused 335 deaths, left-wing attacks caused 22 deaths, and ethnonationalist terrorists caused 5 deaths."[1]
"In analyzing fatalities from terrorist attacks, religious terrorism has killed the largest number of individuals—3,086 people—primarily due to the attacks on September 11, 2001, which caused 2,977 deaths.10 The magnitude of this death toll fundamentally shaped U.S. counterterrorism policy over the past two decades. In comparison, right-wing terrorist attacks caused 335 deaths, left-wing attacks caused 22 deaths, and ethnonationalist terrorists caused 5 deaths."[1]
[1]https://www.csis.org/analysis/escalating-terrorism-problem-u...