Although the bureau investigates crimes committed outside the United States against U.S. citizens and U.S. interests (such as embassies), it may arrest individuals on foreign soil only in cases where the U.S. Congress has granted it jurisdiction and where the host country consents.

Due to “concurrent jurisdiction,” state and local law enforcement agencies are not subordinate to the FBI, and the FBI does not supervise or take over their investigations. Instead, the investigative resources of the FBI and state and local agencies are often pooled in a common effort to investigate and solve the cases. In fact, many task forces composed of FBI agents and state and local officers have been formed to locate fugitives and to address serious threats like terrorism and street violence. The FBI has jurisdiction over violations of more than 200 categories of federal crimes such as counter-terrorism, counterintelligence, and criminal investigative organization.