Ten Years After 9/11, Memorial Opens with Official Ceremony
Families of those who lost their lives on Sept. 11, 2001, gathered at the memorial located at the former site of the World Trade Center on Sunday.

President Obama speaks at the 9/11 Memorial during the tenth anniversary ceremonies of the September 11, 2001 terrorist attacks at the World Trade Center site, September 11, 2011 in New York City. Allan Tannenbaum-Pool/Getty Images
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