NSA Surveillance Thwarted Attacks

June 20, 2013 - 5:34 PM
FILE - This Sept. 19, 2007 file photo shows the National Security Agency building at Fort Meade, Md. As many as one of every five worldwide terror threats picked up by U.S. government surveillance has been targeted on the United States, the Obama administration says. But officials are reluctant to say much more about the 50 plots they claim have been thwarted. (AP Photo/Charles Dharapak, File)