Nation, New York City mark the 12th anniversary of the September, 11, 2001 (9/11) attacks September 11, 2013.
President Barack Obama, first lady Michelle, Vice President
President Barack Obama, first lady Michelle, Vice President Joseph Biden, his wife Jill, and White House staff observe a moment of silence to mark the 12th anniversary of the 9/11 attacks September 11, 2013 on the South Lawn of the White House in Washington, DC. (Credit: Alex Wong/Getty)
President Obama participates in a wreath laying ceremony
President Obama participates in a wreath laying ceremony at the Pentagon in remembrance of the 12th anniversary of the 9/11 terrorist attacks, at the Pentagon in Arlington, Virginia, on 11 September 2013. (Credit: EPA KEVIN DIETSCH / POOL)
Opening ceremonies at the 9/11 Memorial during ceremonies
Opening ceremonies at the 9/11 Memorial during ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York, September 11, 2013. (Credit: Getty/ALLAN TANNENBAUM)

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From left, Former NY Mayor Rudy Giuliani, Mayor
From left, Former NY Mayor Rudy Giuliani, Mayor Michael Bloomberg, NY Gov. Chris Christie with wife Mary Pat and NY State Gov. Andrew Cuomo take part in the national anthem while attending the 9/11 Memorial ceremonies. Also present: Democratic mayoral candidate Bill de Blasio and Public Advocate Candidate Daniel Squadron, center. (Credit: Getty Pool)
NJ Gov. Chris Christie puts a flower by
NJ Gov. Chris Christie puts a flower by the name of Walter Philip Travers who died on 9-11, when he was working at Cantor Fitzgerald as he attends the 9/11 Memorial during the ceremony. Walter Philip Travers' sister-in-law Patty Cuddy, and his niece Julia Cuddy, 19 of Ramsey NJ were standing next to Christie, and received his good wishes. Mary Pat Foster, the governor's wife was looking on from the left in photo. (Credit: EPA/Ozier Muhammad / POOL)
The nation is commemorating the anniversary of the
The nation is commemorating the anniversary of the 2001 attacks which resulted in the deaths of nearly 3,000 people at theWorld Trade Center, the Pentagon in Arlington, Virginia and Shanksville, Pennsylvania. (Credit: John More/Getty)
A view of a flowers and pictures left
A view of a flowers and pictures left along the North Pool at the 9/11 Memorial. (Credit: Getty/JUSTIN LANE)
People gather around the South Tower pool during
People gather around the South Tower pool during memorial ceremonies for the 12th anniversary of the attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Credit: Getty/Andrew Burton)

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NEW YORK, NY - SEPTEMBER 11: A couple
NEW YORK, NY - SEPTEMBER 11: A couple pauses along the edge of the North Pool at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. The nation is commemorating the anniversary of the 2001 attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. Following the attacks in New York, the former location of the Twin Towers has been turned into the National September 11 Memorial & Museum. (Photo by Justin Lane-Pool/Getty Images) (Credit: Getty Pool)
Relatives and friends attend the 9/11 Memorial during
Relatives and friends attend the 9/11 Memorial during a ceremony marking the 12th Anniversary of the attacks on the World Trade Center. (Credit: Getty/DAVID HANDSCHUH)
People etch names on the South Pool of
People etch names on the South Pool of the 9/11 Memorial. (Credit: Getty Pool)
Carrie Bergonia of Pennsylvania looks over the name
Carrie Bergonia of Pennsylvania looks over the name of her fiance, firefighter Joseph Ogren at the 9/11 Memorial. (Credit: Getty Pool)
Mercedes Arias listens as they read the name
Mercedes Arias listens as they read the name of her father Joseph Amatuccio at the 9/11 Memorial during ceremonies marking the 12th anniversary of the 9/11 attacks. (Credit: EPA/ALEJANDRA VILLA / POOL)

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A woman prays at the edge of the
A woman prays at the edge of the North Pool at the 9/11 Memorial during a ceremony marking the 12th anniversary of the 9/11 attacks on the World Trade Center. (Credit: EPA/JUSTIN LANE / POOL)
Family members of Ji Yao Justin Zhao pay
Family members of Ji Yao Justin Zhao pay their respects to him at the South Pool at the 9/11 Memorial (Credit: EPA/MARY ALTAFFER / POOL)