Which agency is designated as the lead during a terrorist attack?

The Federal Bureau of Investigation (FBI) is designated as the lead agency during a terrorist attack due to its specialized role in national security and counterterrorism efforts. The FBI has the authority and expertise to investigate and respond to acts of terrorism on U.S. soil. The agency coordinates with various federal, state, and local entities to manage the situation effectively, ensuring that information is shared, resources are allocated properly, and victims receive necessary assistance.

While other agencies, such as the Department of Homeland Security, play critical roles in preventing and responding to terrorism, the FBI's jurisdiction in criminal investigations, combined with its intelligence capabilities, positions it as the go-to agency for managing terrorist events. Local law enforcement also plays an essential part in immediate response and maintaining public safety but operates under the broader direction of the FBI during these specific incidents. The CIA focuses more on intelligence gathered outside the U.S., which makes its role secondary in domestic terrorist situations.