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James Comey, director of the Federal Bureau of Investigation (FBI), left, speaks during a news conference with Loretta Lynch, U.S. attorney general, at the Department of Justice in Washington, D.C., U.S., on Thursday, Nov. 19, 2015. Comey told reporters that the greater threat in the U.S. is troubled people inspired by Islamic State attacks, rather than the coordinated attacks as in Paris and that Americans shouldnt let fear rule their lives. Photographer: Andrew Harrer/Bloomberg via Getty Images

James Comey, director of the Federal Bureau of Investigation (FBI), left, speaks during a news conference with Loretta Lynch, U.S. attorney general, at the Department of Justice in Washington, D.C., U.S., on Thursday, Nov. 19, 2015. Comey told reporters that the greater threat in the U.S. is troubled people inspired by Islamic State attacks, rather than the coordinated attacks as in Paris and that Americans shouldnt let fear rule their lives. Photographer: Andrew Harrer/Bloomberg via Getty Images