Top US intelligence officials said Saturday that information gleaned from two controversial data collection programs run by the National Security Agency thwarted potential terrorist plots in the US 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 US 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.
No other new details about the plots or the countries involved were part of the newly declassified information released to Congress on Saturday and made public by the Senate Intelligence Committee. Intelligence officials said they are working to declassify the dozens of plots NSA chief Gen Keith Alexander said were disrupted,to show Americans the value of the programs,but that they want to make sure they dont inadvertently reveal parts of the US counterterrorism playbook in the process.
The release of information follows a bruising week for US intelligence officials who testified in Congress,defending programs that were unknown to the public and some lawmakers until they were revealed by a series of media stories in The Guardian and The Washington Post,leaked by former NSA contractor Edward Snowden,who remains in hiding in Hong Kong.
Intelligence officials said Saturday that both NSA programs are reviewed every 90 days by the secret court authorised by the FISA. Under the program,the records,showing things like time and length of call,can only be examined for suspected connections to terrorism,they said.