The Threat Screening Center or the TSC, is a division of the National Security Branch of the Federal Bureau of Investigation. It is the duty of the TSC to identify suspected or potential terrorists. Though housed within the FBI, the TSC is a multi-agency organization, including representatives from the United States Department of Justice, the United States Department of State, the United States Department of Homeland Security, the United States Department of Defense, the United States Postal Service, and various private contractors. It is located in Vienna, Virginia, near Virginia State Route 123.