I read from the FBI's Office of the Inspector General (OIG) report which was publicly released in June 2006.
In this section of the chapter, by mid-2000, Drug Enforcement Administration (DEA) personnel arranged for FBI Legal Attaché (Legat) Office personnel overseas to meet a source who had substantial information on Bin Laden and his operatives and operations.
Beginning in 2000, the CIA and FBI began to debrief the source on a regular basis.
Over the course of several months, the source frequently was shown photographs and asked to identify people in them.
The source described an individual known as “Khallad” as a trusted senior Bin Laden operative with potential connections to the East African embassy bombings.