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Federal prosecutors last week charged a Qatari man studying in the United States with lying to the FBI and disclosed an investigation of his potential links to an alleged top financier of Osama bin Laden.

Shrewd recruiting of new, young militants has allowed Al Qaida to reestablish itself in Saudi Arabia and around the world as an elusive and deadly threat that is seeking to launch new attacks in the United States and other countries, many U.S. officials now believe.