Threat Level Orange: U.S. Cities With the Most Reported Terrorism

"The coordinated terrorist attacks of September 11, 2001, stand as one of the deadliest events in U.S. history. That day, nearly 3,000 Americans were violently killed in New York, Pennsylvania, and outside Washington, D.C. - the most in any single day since the Battle of Antietam 139 years earlier. While the United States has not suffered through anything approaching the scale of 9/11 in the years since, the FBI maintains that the threat of terrorism has expanded considerably in the last two decades."

"The threat of terrorism - whether of international or domestic origin - has grown, in part, due to a shift toward individual offenders acting alone and away from large-scale conspiracies. Because lone offenders have no affiliation or communication with a larger group, they are more difficult for law enforcement to detect and prevent. The Internet and social media have fueled this trend by acting as platforms for radicalization and recruitment."

"According to the Department of Homeland Security, domestic terrorism investigations have more than quadrupled in the last 10 years. Between 2010 and 2021 alone, there were 231 reported incidents of domestic terrorism in the United States. The largest share of these attacks - 35% - were determined to have been racially or ethnically motivated, and 32% were fueled by anti-government ideologies."

Nearly 3,000 Americans were killed in the September 11, 2001 attacks, the deadliest single day since Antietam. Terrorism in the United States has expanded over two decades, shifting toward lone offenders who act without group affiliation, which hinders detection. The Internet and social media have enabled radicalization and recruitment. Department of Homeland Security data show domestic terrorism investigations more than quadrupled in the last ten years. Between 2010 and 2021 there were 231 reported domestic terrorism incidents; 35% were racially or ethnically motivated and 32% were anti-government. Most violent terrorist plots have occurred in or around major metropolitan areas.

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