Since September 11, 2001, which agency is considered the main federal investigative agency for terrorism?

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Since September 11, 2001, the FBI has been considered the main federal investigative agency for terrorism, with its primary focus on preventing future attacks through intelligence gathering and inter-agency cooperation. The other agencies listed (Secret Service, DEA, U.S. Marshals) have different areas of focus and are not primarily dedicated to investigating terrorism.

Since September 11, 2001, Which Agency Is Considered the Main