September 11, 2008 (42 images)

A man walks through some of the 3,000 flags set up on display representing the victims of the September 11th attacks during the Pentagon Memorial dedication ceremony, on the seventh anniversary of the September 11th attacks on the Pentagon and the World Trade Center in New York City, at the Pentagon in Arlington, Virginia on September 11, 2008. (UPI Photo/Kevin Dietsch)

People visit the 9/11 Memorial at the Pentagon, dedicated today in Arlington, Virginia on September 11, 2008. The memorial commemorates the 184 lives lost at the Pentagon and on American Airlines Flight 77 during the September 11, 2001 terrorist attacks. (UPI Photo/Alexis C. Glenn)

Democratic presidential candidate Senator Barack Obama (D-IL) pauses for a moment of silence at the site of the former twin towers, on the seventh anniversary of the attack on the World Trade Center, in New York September 11, 2008. (UPI Photo/Peter Foley/POOL)

Jennhy Parbhu cries as she attends the ceremony at Zuccotti Park in lower Manhattan on the seventh anniversary of the attack on the World Trade Center, in New York September 11, 2008. (UPI Photo/Timothy A. Clary/POOL)