“In December 1999, NSA [National Security Agency] intercepted another series of telephone calls coming into [al Qaeda operative Ahmed Mohammed Ali] al-Hada’s home in Sana’a [Yemen], which revealed that an ‘operational cadre’ of al Qaeda operatives intended to travel to Kuala Lumpur, Malaysia, in early January 2000. The transcript of the intercepted call identified only the first names of the team–‘Nawaf,’ ‘Salem,’ and ‘Khalid.’ Based on the context and wording of the conversation, NSA analysts concluded that ‘Salem’ was most likely the younger brother of ‘Nawaf,’ which, as it turned out, was correct. ‘Salem’ was a Saudi national named Salem al-Hazmi, who was the younger brother of Nawaf al-Hazmi. A CIA analyst who reviewed the transcript and accompanying NSA intelligence report surmised that ‘something more nefarious [was] afoot but did nothing further with the report.’ “ Nawaf, Salem, and Khalid were among the nineteen hijackers on 9/11. [The 15th of the month used for date sorting purposes only.]
– Matthew M. Aid, The Secret Sentry, Page 211