The FBI is investigating several cases in the United States of “persons that we are concerned about because they are potential [Al Qaeda]operatives,” FBI director Robert Mueller told U.S. News & World Report. Some may be recruiting terrorists, others financing them or training them, Mueller said. “Our greatest concern is that which we do not know.”
Mueller said it was difficult for Al Qaeda to replace someone like Khalid Shaikh Mohammed, thhe mastermind of the Sept. 11, 2001, attacks, Mueller told the magazine. Khalid “was a leader, was computer literate, a very good organizer, was close to [Osama bin Laden] and understood, most particularly, our vulnerabilities….A person who wants to commit some sort of suicide attack is not very hard to replace.”
Link: http://www.usnews.com/usnews/issue/040315/usnews/15nine11.b.htm