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ASSOCIATED PRESS This image made available by IntelCenter and taken from a Web site frequently used by militants to disseminate their messages purports to show Mr. Abdulmutallab. In a statement posted on the Web site dated Saturday, al Qaeda in the Arabian Peninsula has claimed responsibility for the attack. In the statement, al Qaeda in the Arabian Peninsula said Mr. Abdulmutallab coordinated with members of the group, an alliance of militants based in Saudi Arabia and Yemen.

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