Robert Peraza, who lost his son Robert David Peraza, pauses at his son's name at the North Pool of the 9/11 Memorial at the site of the World Trade Center. Justin Lane/pool/Getty Images hide caption
Remembering Sept. 11 Remembering Sept. 11
Singer Patti LaBelle performs during the "Concert For Hope" event, hosted by Washington National Cathedral, to mark the tenth anniversary of the 9/11 terrorist attacks. Alex Wong/Getty Images hide caption
Alan Jackson
U.S. soldiers pray during the an anniversary ceremony of the terrorist attacks on September 11, 2001 at Bagram Air Field, Afghanistan. John Moore/Getty Images hide caption
Keri McMorrow, 7, visits the memorial pool where her uncle's name is engraved, during tenth anniversary ceremonies of the September 11, 2001 terrorist attacks at the World Trade Center site. Pool/Getty Images hide caption
Kids and Sept. 11: The Day 'Children Realized ... Grownups Were Vulnerable'
Family members of the victims entered the 9/11 Memorial Plaza for the first time today. Chip Somodevilla/Getty Images hide caption
Paul Simon singing 'The Sound of Silence'
From New Jersey early today, the view across the Hudson River to the World Trade Center. Joel Rose/NPR hide caption
President Obama looked out at the North Pool of the 9/11 Memorial in New York earlier this morning. Andrew Burton/Getty Images hide caption
Cellist Yo-Yo Ma at the Sept. 11 service in New York
The "Tribute in Light" illuminates the sky in New York on the 10th anniversary of the Sept. 11 attacks. Timothy A. Clary/AFP/Getty Images hide caption
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