Assertion: extremist's attack | /r/HasProperty | perpetrated by group
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Source sentences:
text: The Combating Terrorism Center at West Point, which compiles data on “all violent attacks that were perpetrated by groups or individuals affiliated with far-right associations,” counted an average of 337 annual attacks by right-wing extremists in the decade after 9/11, including a total of 254 fatalities, or an annual average of about 18 deaths.