11.   Canadian police, in fact, said Thursday they might have a lead on how the suspected hijackers obtained false documents.

12.   Cohen said Al-Hallack did not know the suspected hijackers of the flight from Dulles.

13.   Computers have been seized at the residences of suspected hijackers, others believed to be associated with them, and at public libraries and other places.

14.   Early Wednesday, FBI agents searched Huffman Aviation in Venice, Fla., where they believed two suspected hijackers learned to fly commuter jets last year.

15.   Essabar, a Moroccan citizen, made arrangements to travel to Florida in February when Atta and suspected hijacker Marwan Alshehhi were there.

16.   Fake identification papers are central to the case, because investigators now believe that at some of the suspected hijackers assumed identities of people who are still alive.

17.   He has admitted knowing another suspected hijacker, Nawaf Alhazmi.

18.   He has been linked to at least six other suspected hijackers who boarded the two doomed flights at Logan Airport.

19.   He reached a plea bargain with prosecutors in December, admitting that he helped two suspected hijackers get false Virginia identification cards a month before the attacks.

20.   He said he was shown an array of photographs, apparently of suspected hijackers, and was asked whether he knew any of them.