Communications Exploitation Section
The Communications Exploitation Section (CXS), established in December 2002, is an office of the Operations II branch of the FBI Counterterrorism Division, which is tasked with analyzing captured communications data (such as phone call records and internet traffic) to identify and monitor "terrorist" networks.
From 2003 to 2005, CXS sent out 739 "exigent letters" to U.S. telephone companies requesting that they send phone call records for their customers.
- "Statement of John S. Pistole, Executive Assistant Director, Counterterrorism/Counterintelligence, FBI Before the National Commission on Terrorist Attacks upon the United States". Federal Bureau of Investigation (official website). April 14, 2004. Archived from the original on March 11, 2009. Retrieved 2009-03-19.
- O'Brien, Luke (March 21, 2007). "AT&T, Verizon: We Obeyed FBI "Emergency" Requests - 739 of Them". Threat Level (Wired). Retrieved 2009-03-19.
- A Review of the Federal Bureau of Investigation's Use of Exigent Letters and Other Informal Requests for Telephone Records, U.S. Department of Justice, Office of the Inspector General, Oversight and Review Division, January 2010 (Accessed: August 14, 2010)
- Robert Mueller, The FBI's Counterterrorism Program: Report to The National Commission on Terrorist Attacks upon the United States
- Bassem Youssef Letter to Director Mueller
- Ryan Singel (August 16, 2007). "FBI Office Under Investigation Involved in Secret Spying Controversy". Wired, Threat Level.