Gen. Keith B. Alexander, director of the National Security Agency and head of the U.S. Cyber Command, said on Wednesday he would discuss specific foiled terrorist plots in more detail Thursday during a closed congressional hearing on the NSA leak. (Associated Press)

Gen. Keith B. Alexander, director of the National Security Agency and head of the U.S. Cyber Command, said on Wednesday he would discuss specific foiled terrorist plots in more detail Thursday during a closed congressional hearing on the NSA leak. (Associated Press)