There have been 56 ISIS-related arrests in the U.S. this year

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The U.S. saw its highest level of terrorism-related arrests since September 2001 this year, a study released Tuesday reveals. Through a review of social media accounts and legal documents, researchers at George Washington University found that 56 individuals were arrested in 2015 for either supporting ISIS or plotting to assist the extremist group. "The individuals range from hardened militants to teenage girls, petty criminals, and college students," GWU's director of the program on extremism Lorenzo Vidino told The New York Times. "The diversity is staggering."

That diversity, Vidino suggests, is exactly why identifying and monitoring potential terrorist threats can be such a challenge for law enforcement agencies. "For law enforcement, it's extremely difficult to determine who makes a big leap from keyboard jihadist to doing something," Vidino said.

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