Officials: NSA Programs Broke Plots in 20 Nations

Top U.S. intelligence officials said that information gleaned from two controversial data-collection programs run by the National Security Agency thwarted potential terrorist plots in the U.S. and more than 20 other countries — and that gathered data is destroyed every five years.

Last year, fewer than 300 phone numbers were checked against the database of millions of U.S. phone records gathered daily by the NSA in one of the programs, the intelligence officials said in arguing that the programs are far less sweeping than their detractors allege. The officials offered more detail on how the phone records program helped the NSA stop a 2009 al-Qaida plot to blow up New York City subways. They say the program helped them track a co-conspirator of al-Qaida operative Najibullah Zazi — though it's not clear why the FBI needed the NSA to investigate Zazi's phone records because the FBI would have had the authority to gather records of Zazi's phone calls after identifying him as a suspect, rather than relying on the sweeping collection program.