New York — The National September 11 Memorial was opened to the public Monday after a day of remembrance by survivors and dignitaries on the 10th anniversary of the attacks Sunday.

PHOTOGRAPH BY: JIM YOUNG / Reuters

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New York — New York Mayor Michael Bloomberg, center right, and other city officials greet visitors on the first day that the National September 11 Memorial was opened to the public.

PHOTOGRAPH BY: MIKE SEGAR / pool

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New York — Visitors make rubbings of the names of victims inscribed on the wall surrounding one of the pools at the National September 11 Memorial.

PHOTOGRAPH BY: Mike Segar / Pool

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New York — A rose and an American flag decorate the etched name of a firefighter who died in the 9/11 attacks.

PHOTOGRAPH BY: Mike Segar / Pool

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New York — A visitor to the National September 11 Memorial makes a rubbing of a name using a blue marker and a list of the names of those killed in the 9/11 attack.

PHOTOGRAPH BY: SETH WENIG / AFP

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New York — The lights in remembrance of the World Trade Center Twin Towers shine on a cloudy night, part of the 10th-anniversary ceremonies at the site of the World Trade Center on Sept. 11, 2011.

PHOTOGRAPH BY: CAROLYN COLE / Los Angeles Times

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New York — A woman mourns the loss of her son at the World Trade Center Memorial during ceremonies marking the 10th anniversary of the 9/11 attacks on the landmark on September 11, 2011.

PHOTOGRAPH BY: CAROLYN COLE / Los Angeles Times

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New York — Finn Straine, 12, left, and his brother, Charlie Straine, 10, stand by the name of their father, 9/11 victim James Straine Jr., during the ceremonies marking the 10th anniversary of the attacks.

PHOTOGRAPH BY: CAROLYN COLE / Los Angeles Times

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New York — Laura Bush, former President George W. Bush, First Lady Michelle Obama and President Obama bow their heads during a moment of silence during the 10th-anniversary ceremonies at the site of the World Trade Center.

PHOTOGRAPH BY: Noah K. Murray / Pool

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New York — President George W. Bush and family and President Obama and First Lady Michelle Obama visit the World Trade Center site.

PHOTOGRAPH BY: Carolyn Cole / Los Angeles Times

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New York — Family members of victims of the 9/11 attacks enter the September 11 Memorial plaza for the first time.

PHOTOGRAPH BY: Chip Somodevilla / Reuters

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New York — An overview of the September 11 Memorial, which hosted 10th-anniversary commemoration ceremonies Sunday.

PHOTOGRAPH BY: Mladen Antonov / AFP

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New York — Members of the Fire Department of New York Emerald Society Pipes and Drums enter the memorial site at the start of Sunday's ceremonies.

PHOTOGRAPH BY: Carolyn Cole / Los Angeles Times

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New York — Vasantha Velamuri leans on the name of her husband, Sankara Sastry Velamuri, who died in the World Trade Center.

PHOTOGRAPH BY: Carolyn Cole / Los Angeles Times

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New York — Julie Jalbert-Pitt holds her 8-month-old daughter, Campbell Pitt, next to the name of Robert Jalbert, Jalbert-Pitt's father, who died on 9/11.

PHOTOGRAPH BY: Carolyn Cole / Los Angeles Times

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New York — Members of the New York Police Department stand at attention during the playing of the national anthem during the 10th anniversary ceremonies.

PHOTOGRAPH BY: Carolyn Cole / Los Angeles Times

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New York — A woman cries while looking at names inscribed at the North Pool of the National September 11 Memorial.

PHOTOGRAPH BY: Justin Lane / Pool

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New York — One of two commemorative pools at the National September 11 Memorial.

PHOTOGRAPH BY: Mark Blinch / Reuters

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New York — One of the friends and relatives of 9/11 victims gathered to commemorate the 10th anniversary.

PHOTOGRAPH BY: Jason DeCrow / Associated Pres

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New York — Police and firefighters salute during the singing of the Star Spangled Banner at an entrance to the 9/11 Memorial Plaza.

PHOTOGRAPH BY: Chip Somodevilla / Pool

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New York — Families gather around the South Memorial Pool at the National September 11 Memorial.

PHOTOGRAPH BY: Timothy A. Clary / Pool

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Arlington, Va. — Chairman of the Joint Chiefs of Staff Mike Mullen, left, Secretary of Defense Leon Panetta and Vice President Joseph Biden listen to the national anthem at the National 9/11 Pentagon Memorial.

PHOTOGRAPH BY: Shawn Thew / EPA

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Shanksville, Pa. — Interior Secretary Ken Salazar, former President George W. Bush, former First Lady Laura Bush and former President Bill Clinton at a ceremony in Pennsylvania where one of the 9/11 planes crashed.

PHOTOGRAPH BY: Jason Cohn / Reuters

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New York — President Obama, right, steps forward to read the names of some of the victims of the Twin Towers' collapse as he tours the 9/11 memorial site with First Lady Michelle Obama, former President George W. Bush and former First Lady Laura Bush.

PHOTOGRAPH BY: Timothy A. Clary / Pool

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New York — Former President George W. Bush embraces a family member of one of the victims of the 9/11 attacks as the two most recent presidents and their wives met with honored guests at the National September 11 Memorial.

PHOTOGRAPH BY: Chip Somodevilla / Pool

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New York — President Obama, First Lady Michelle Obama, former President George W. Bush and former First Lady Laura Bush walk beside the North Memorial Pool at the World Trade Center site.

PHOTOGRAPH BY: Larry Downing / Reuters

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New York — Robert Peraza, who lost his son Robert David Peraza in the attack, kneels before his son's name at the National September 11 Memorial.

PHOTOGRAPH BY: Justin Lane / Pool

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New York — Christine Corday, a worker at the 9/11 memorial, puts the final touches on plaques bearing the names of those killed in the attack.

PHOTOGRAPH BY: Mary Altaffer / Associated Press

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New York — Visitors hug near a memorial pool at the National September 11 Memorial at the World Trade Center site in New York, September 11, 2011.

PHOTOGRAPH BY: CAROLYN COLE / Los Angeles Times

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New York — A group hug beside a waterfall at the National September 11 Memorial.

PHOTOGRAPH BY: Matt Rourke / Associated Press

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New York — The view at dawn from one corner of the north pool at the National September 11 Memorial.

PHOTOGRAPH BY: Mary Altaffer / Associated Press

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New York — Thousands gathered in and around Ground Zero to commemorate the 10 years since the terrorist attacks of September 11.

PHOTOGRAPH BY: Michael Robinson Chavez / Los Angeles Times

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New York — Security was heavy around the site with hundreds of police and barricades set up to as thousands gathered in and around Ground Zero to commemorate the 10 years since the terrorist attacks.

PHOTOGRAPH BY: Michael Robinson Chavez / Los Angeles Times

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Kabul — U.S. Marines stand guard near a sculpture of the New York Skyline made from the steel ruins of the Twin Towers, during a memorial ceremony in remembrance of those who perished ten years ago during the 9/11 attacks, at the US embassy in Kabul on September 11, 2011.

PHOTOGRAPH BY: MASSOUD HOSSAINI / AFP

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Baghdad — U.S. Army soldiers from 1st Squadron, 7th U.S. Cavalry based in Ft. Hood, Texas, salute during a memorial service for victims of the Sept. 11, 2001 terror attacks, at a U.S. base in Balad, Iraq, Sunday, Sept. 11, 2011.

PHOTOGRAPH BY: Hadi Mizban / Associated Press

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New York — Firefighter Rob Derrick salutes fallen comrades at a bronze memorial wall at Ladder Co. 10 near the World Trade Center site early Sunday.

PHOTOGRAPH BY: Mike Segar / Reuters

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New York — The World Trade Center is aglow in light as dawn begins to break in Manhattan.

PHOTOGRAPH BY: Mark Lennihan / Associated Press

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New York — The Tribute in Light -- taking the place in skyline of the fallen Twin Towers -- rises over the Brooklyn Bridge and lower Manhattan overnight Saturday night.

PHOTOGRAPH BY: Peter Lennihan / Associated Press

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New York — The Tribute in Light shines above the Statue of Liberty and One World Trade Center, left, Saturday night.

PHOTOGRAPH BY: Mark Lennihan / Associated Press

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New York — People view the Tribute in Light from the observation deck atop Rockefeller Center in Midtown Manhattan.

PHOTOGRAPH BY: Mario Tama / Getty Images

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New York — The Tribute in Lights in the skies of New York.

PHOTOGRAPH BY: Jim Young / Reuters

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Kennesaw, Ga. — Ruth Gillespie leads a long line of flag bearers in 9/11 anniversary ceremonies Saturday at Kennesaw Mountain National Battlefield Park.

PHOTOGRAPH BY: David Tulis / Associated Press

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Kennesaw, Ga. — Judy and Bob Poore place a flag at Kennesaw Mountain National Battlefield Park on Saturday to commemorate the 10th anniversary of the Sept. 11 attacks and remember their friend Ann Ransom, one of nearly 3,000 people killed in the terror attacks. A flag is placed in the battlefield for each Sept. 11 victim as part of the Field of Flags installation. The flags will remain flying through Sept. 16.

PHOTOGRAPH BY: David Tulis / Associated Press

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New York — A pedestrian walks past a Sept. 11 tribute at Bryant Park. The 2,753 empty chairs have been put in place to remember the lives that were lost in the attacks on the World Trade Center.

PHOTOGRAPH BY: Don Emmert / AFP

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New York NY, United States — New York Gov. Andrew Cuomo, center, prepares to march in the New York Labor Day Parade in Midtown Manhattan the annual parade featured local and state politicians and union workers from the private and public sectors.

PHOTOGRAPH BY: Chip Somodevilla / Getty Images

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New York — A day before the 10th anniversary of the 9/11 attacks on the World Trade Center and Pentagon, New York Police officers keep watch along the perimeter of the New York Labor Day Parade as it moved north on Fifth Avenue in Midtown Manhattan.

PHOTOGRAPH BY: Chip Somodevilla / Getty Images

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New York — Rich Keil, of East Islip, N.Y., marches up Fifth Ave during the Labor Parade Saturday in New York. Members of hundreds of unions are honoring labor by marching in a New York City parade laced with remembrances of the Sept. 11 attacks.

PHOTOGRAPH BY: Mary Altaffer / Associated Press

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New York — To commemorate the 10-year anniversary of the Sept. 11 attacks, a participant in the "Hand-In-Hand 9/11" ceremony leaves personal messages on the Wall of Remembrance, portions of which will be displayed at the 9/11 Memorial Museum, in Battery Park in Lower Manhattan.

PHOTOGRAPH BY: Chip Somodevilla / Getty Images

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New York, N.Y. — A woman visits a mural established in the memory of those who died in the Sept. 11 attacks on the World Trade Center.

PHOTOGRAPH BY: Jim Young / Reuters

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Arlington — Army Lt. Col. Al Versoza visits the grave of his friend and colleague Army Major Stephen Long, who died in the Sept. 11 terrorist attack on the Pentagon, in Section 64 of Arlington National Cemetery.

PHOTOGRAPH BY: Brendan Smialowski / Getty Images

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Arlington — A headstone for a victim of the Sept. 11th terrorist attack on the Pentagon in Section 64 of Arlington National Cemetery.

PHOTOGRAPH BY: Brendan Smialowski / Getty Images

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Shanksville, Pa. — Left to right, Secretary of the Interior Ken Salazar, former President George W. Bush, former First Lady Laura Bush and former President Bill Clinton view the Wall of Names as Dr. Jill Biden and Vice President Joe Biden walk alongside during the dedication of phase one of the permanent Flight 93 National Memorial near the crash site of United Flight 93 in Shanksville, Pa.

PHOTOGRAPH BY: Gene J. Puskar / Associated Press

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Shanksville, Pa. — Dr. Jill Biden wipes a tear away as her husband, Vice President Joe Biden, bows his head during ceremonies marking the 10th anniversary of the crash of United Flight 93.

PHOTOGRAPH BY: Jason Cohn / Reuters

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Washington — Former President George W. Bush pauses after placing a wreath at the impact point of Flight 77 at the Pentagon. U.S. Chairman Joint Chiefs of Staff Admr. Mike Mullen and his wife Debra Mullen also attended.

PHOTOGRAPH BY: Paul J. Richards / AFP

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Jersey City, N.J. — View from Liberty State Park in Jersey City, N.J., shows the Freedom Tower lighted in red, white and blue Friday.

PHOTOGRAPH BY: Julio Cortez / Associated Press

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New York — National and city leaders will commemorate the 10-year anniversary of the Sept. 11 terrorist attacks with the ceremonial unveiling of a memorial and museum at the World Trade Center site.

PHOTOGRAPH BY: Jim Young / Reuters

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New York — A Port Authority officer stands guard near the south reflecting pool at the World Trade Center memorial.

PHOTOGRAPH BY: Don Emmert / Agence France-Presse

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New York — The memorial includes inscriptions for the flights that crashed into the World Trade Center. Bronze panels that ring the two reflecting pools bear the names of all of the Sept. 11 victims, as well as those who died during the 1993 attack on the trade center.

PHOTOGRAPH BY: Scott Strazzante / Chicago Tribune

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New York — The Freedom Tower stands tall behind the south pool waterfall.

PHOTOGRAPH BY: Don Emmert / Agence France-Presse

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Arlington, Va. — Matt Haar helps unfold the flag before an event in the Pentagon courtyard.

PHOTOGRAPH BY: Susan Walsh / Associated Press

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Shanksville, Pa. — A 17-ton boulder marks the site where hijacked United Flight 93 crashed on Sept. 11, 2001.

PHOTOGRAPH BY: Jacqueline Larma / Associated Press

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