According to the agency, the 27-year-old El Shukrijumah uses a number of aliases, including Adnan G. El Shukri Jumah, Abu Arif, Ja'far Al-Tayer, Jaffar Al-Tayyar, Jafar Tayar and Jaafar Al-Tayyar, and is suspected of carrying a Guyana passport, among passports from other countries.

The FBI said too that the suspect, who is about 5-foot-4 and 132 pounds, though he may be heavier, has black hair, black eyes and a Mediterranean complexion, and may be wearing a beard, is possibly involved with al-Qaeda terrorist activities and, if this is the case, he may pose a serious threat to U.S. citizens and interests worldwide.

FBI Director, Robert S. Mueller III in a March 20 address on "Operation Liberty Shield", regarding the FBI's extraordinary measures to protect the American people in the midst of the conflict in Iraq had said, "We are running down every lead, responding to every threat, coordinating with every partner, and doing our utmost to keep terrorists from striking back."