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Investigators work the scene of a shooting at a supermarket, in Buffalo, N.Y., Monday, May 16, 2022. While law enforcement officials have grown adept since the Sept. 11 attacks at disrupting well-organized plots, they face a much tougher challenge in intercepting self-radicalized young men who absorb racist screeds on social media and plot violence on their own. (AP Photo/Matt Rourke)