Kellen Savoy, center, helps present the colors as students raise the flag at William Lloyd Meador Elementary School in Willis, Texas, on September 11, 2013, during a ceremony in observance of the 9/11 terrorist attacks. Observances were held at the sites of the attacks that killed nearly 3,000 people in Lower Manhattan, at the Pentagon and southwestern Pennsylvania in 2001. Tributes were also held across the United States:
America remembers 9/11 —
Kellen Savoy, center, helps present the colors as students raise the flag at William Lloyd Meador Elementary School in Willis, Texas, on September 11, 2013, during a ceremony in observance of the 9/11 terrorist attacks. Observances were held at the sites of the attacks that killed nearly 3,000 people in Lower Manhattan, at the Pentagon and southwestern Pennsylvania in 2001. Tributes were also held across the United States:
Jason Fochtman/The Courier/AP
Hector Garcia, center, of Brooklyn, and his daughter Tania attend ceremonies in New York on September 11. Garcia is carrying a photograph of his daughter Marilyn, Tania's sister, who died in the attacks on the World Trade Center.
America remembers 9/11 —
Hector Garcia, center, of Brooklyn, and his daughter Tania attend ceremonies in New York on September 11. Garcia is carrying a photograph of his daughter Marilyn, Tania's sister, who died in the attacks on the World Trade Center.
Chris Pedota/The Record/Pool/AP
President Barack Obama listens to military taps after laying a wreath at the Pentagon in Arlington, Virginia, on September 11.
America remembers 9/11 —
President Barack Obama listens to military taps after laying a wreath at the Pentagon in Arlington, Virginia, on September 11.
Kevin Dietsch/Pool/Getty Images
Family and friends of Wayne A. Russo attend ceremonies at the 9/11 Memorial in New York on September 11. Russo, an accountant for Marsh & McLennan, died while working in his office in the World Trade Center attacks on 9/11.
America remembers 9/11 —
Family and friends of Wayne A. Russo attend ceremonies at the 9/11 Memorial in New York on September 11. Russo, an accountant for Marsh & McLennan, died while working in his office in the World Trade Center attacks on 9/11.
Adrees Latif/Pool/Getty Images
A group of men says prayers on September 11 in Raleigh, North Carolina, for those who died in the terror attacks.
America remembers 9/11 —
A group of men says prayers on September 11 in Raleigh, North Carolina, for those who died in the terror attacks.
Chris Seward/Raleigh News & Observer/MCT/Sipa USA
Susan Schwarzwald and her husband, Werner Bargsten, attend a memorial ceremony in Jersey City, Jersey.
America remembers 9/11 —
Susan Schwarzwald and her husband, Werner Bargsten, attend a memorial ceremony in Jersey City, Jersey.
Reena Rose Sibayan/The Jersey Journal/Landov
Tonya Festa and her sons attend a memorial ceremony in Jersey City.
America remembers 9/11 —
Tonya Festa and her sons attend a memorial ceremony in Jersey City.
Reena Rose Sibayan/The Jersey Journal/Landov
Ester DiNardo, mother of Marisa DiNardo, clutches a photograph of her daughter at the 9/11 Memorial ceremonies in New York.
America remembers 9/11 —
Ester DiNardo, mother of Marisa DiNardo, clutches a photograph of her daughter at the 9/11 Memorial ceremonies in New York.
Adrees Latif/Pool/Getty Images
A pool at the 9/11 Memorial in New York reflects surrounding buildings during ceremonies for the 12th anniversary of the terrorist attacks.
America remembers 9/11 —
A pool at the 9/11 Memorial in New York reflects surrounding buildings during ceremonies for the 12th anniversary of the terrorist attacks.
Alejandra Villa/Pool/Getty Images
People gather in front of the Pentagon in Arlington, Virginia, before an observance ceremony on September 11.
America remembers 9/11 —
People gather in front of the Pentagon in Arlington, Virginia, before an observance ceremony on September 11.
Chip Somodevilla/Getty Images
President Barack Obama, first lady Michelle Obama, Vice President Joe Biden and his wife, Jill Biden, observe a moment of silence on the South Lawn of the White House on September 11.
America remembers 9/11 —
President Barack Obama, first lady Michelle Obama, Vice President Joe Biden and his wife, Jill Biden, observe a moment of silence on the South Lawn of the White House on September 11.
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Daniel Henry, a police officer with the Port Authority of New York and New Jersey, pauses during a moment of silence at the south reflecting pool of the 9/11 Memorial in New York on September 11.
America remembers 9/11 —
Daniel Henry, a police officer with the Port Authority of New York and New Jersey, pauses during a moment of silence at the south reflecting pool of the 9/11 Memorial in New York on September 11.
STAN HONDA/AFP/Getty Images
Mija Quigley of Princeton Junction, New Jersey, embraces the name of son Patrick Quigley at the 9/11 Memorial on September 11. He died aboard United Airlines Flight 175, which crashed into the World Trade Center on 9/11.
America remembers 9/11 —
Mija Quigley of Princeton Junction, New Jersey, embraces the name of son Patrick Quigley at the 9/11 Memorial on September 11. He died aboard United Airlines Flight 175, which crashed into the World Trade Center on 9/11.
CHRIS PEDOTA/AFP/Getty Images
Showkatara Sharif stands next to the engraving of her daughter's name, Shakila Yasmin, at the edge of the north pool at the 9/11 Memorial in New York on September 11.
America remembers 9/11 —
Showkatara Sharif stands next to the engraving of her daughter's name, Shakila Yasmin, at the edge of the north pool at the 9/11 Memorial in New York on September 11.
Justin Lane/Pool/Getty Images
A man makes a rubbing of his friend's name, New York firefighter Vincent Giammona, at the south pool of the 9/11 Memorial on September 11.
America remembers 9/11 —
A man makes a rubbing of his friend's name, New York firefighter Vincent Giammona, at the south pool of the 9/11 Memorial on September 11.
Stan Honda/Pool/Getty Images
The Tribute in Light marks the 12th anniversary of the 9/11 attacks on the evening of Tuesday, September 10, in New York.
America remembers 9/11 —
The Tribute in Light marks the 12th anniversary of the 9/11 attacks on the evening of Tuesday, September 10, in New York.
GARY HERSHORN/reuters/LANDOV
Visitors check out victims' names at the 9/11 Memorial in New York on September 10.
America remembers 9/11 —
Visitors check out victims' names at the 9/11 Memorial in New York on September 10.
John Moore/Getty Images
A woman kisses one of the 40 names on the Flight 93 National Memorial wall in Shanksville, Pennsylvania, on September 10. United Airlines Flight 93 crashed into a field near Shanksville on 9/11.
America remembers 9/11 —
A woman kisses one of the 40 names on the Flight 93 National Memorial wall in Shanksville, Pennsylvania, on September 10. United Airlines Flight 93 crashed into a field near Shanksville on 9/11.
Gene J. Puskar/AP
A woman takes photos of the 9/11 Memorial in New York on September 10.
America remembers 9/11 —
A woman takes photos of the 9/11 Memorial in New York on September 10.
John Moore/Getty Images
A girl poses among American flags that Pepperdine University students and staff erected in Malibu, California, on September 10.
America remembers 9/11 —
A girl poses among American flags that Pepperdine University students and staff erected in Malibu, California, on September 10.
Zhao Hanrong/xinhua/landov
A beam from the World Trade Center is seen inside the 9/11 Museum in New York on September 10.
America remembers 9/11 —
A beam from the World Trade Center is seen inside the 9/11 Museum in New York on September 10.
John Moore/Getty Images
A flower lies atop names of victims at the 9/11 Memorial in New York on September 10.
America remembers 9/11 —
A flower lies atop names of victims at the 9/11 Memorial in New York on September 10.
John Moore/Getty Images
Patriot Guard rider and U.S. Navy veteran Ron Connally, center, of Oak Harbor, Washington, holds a flag during a ceremony in Bremerton on September 11.
Photos: America remembers 9/11 —
Patriot Guard rider and U.S. Navy veteran Ron Connally, center, of Oak Harbor, Washington, holds a flag during a ceremony in Bremerton on September 11.
Larry Steagall/Kitsap Sun/AP