 The CIA was aware of Mihdhar and Hazmi's involvement with al-Qaeda, having been informed by Saudi intelligence during a 1999 meeting in Riyadh.Based on information uncovered by the FBI in the 1998 United States embassy bombings case, the National Security Agency (NSA) began tracking the communications of Hada, Mihdhar's father-in-law.In late 1999, the NSA informed the CIA of an upcoming meeting in Malaysia, which Hada mentioned would involve "Khalid", "Nawaf", and "Salem", who was Hazmi's younger brother, Salem al-Hazmi.