Images from the September 11 attacks

Firemen are deployed near the site of the World Trade Center in New York, in this Sept. 12, 2001, file photo. In the most devastating terrorist onslaught ever waged against the United States, knife-wielding hijackers crashed two airliners into the World Trade Center, toppling its twin 110-story towers. This year will mark the fifth anniversary of the attacks. (AP Photo/Mark Lennihan/FILE)