"She was a very average, very innocent, lacking confidence, shy and very easy to get on with," Khan said recently. "The person that I knew... I find would be incapable of doing such a sophisticated terrorism activity and it frightens me."
INTERPOL also announced today that it has sent a team Wednesday to Kenya to assist in the investigation of the attack on Nairobi's Westgate mall and to "ensure the swift dissemination" of information the attackers to its member police forces around the world. Kenyan authorities have not yet identified the individual attackers and are investigating whether three Americans may have been involved. American authorities have said so far they have not seen verification U.S. citizens took part, though al-Shabab is known to have a cadre of American recruits.
ABC News' Paolo Marenghi contributed to this report.