Firemen pay their respects at the 9/11 memorial during ceremonies marking the 11th anniversary of the 9/11 attacks on the World Trade Center in New York, September 11, 2012. John Moore/Reuters
Syracuse firefighter Seth Shapess, of Engine Company 3, takes his turn to sit in remembrance on the 9/11 anniversary at Fayette Firefighters Park in Syracuse, N.Y., Sept. 11, 2012. Ellen M. Blalock/AP
A woman embraces a child at the site of the 9/11 Memorial during ceremonies marking the 11th anniversary of the 9/11 attacks on the World Trade Center in New York, September 11, 2012. Eric Thayer/Reuters
President Barack Obama, flanked by Defense Secretary Leon Panetta (l.) and Joint Chiefs Chairman Gen. Martin Dempsey, bow their heads at the Pentagon Memorial,Tuesday, Sept. 11, 2012, during a ceremony to mark the 11th anniversary of the Sept. 11 attacks. Carolyn Kaster/AP
A person stops to read names in New Jersey's memorial to the 749 people from the state lost during the Sept. 11 terrorist attacks on the World Trade Center, as One World Trade Center, now up to 104 floors, looms in the distance across the Hudson River, Sept. 11, 2012 in Jersey City, N.J. Mel Evans/AP
US soldier, Rolando G. Rios, observes a moment of silence during a ceremony marking the 11th anniversary of the Sept. 11 attacks that killed almost 3,000 in the United States, at NATO camp Kaia in Kabul, Afghanistan, Sept. 11, 2012. Musadeq Sadeq/AP
Childhood friends from Italy, Lucrezia Susca (l.) and Chiara Pesce (c.) hold photos of their grandchildren Grace Gollante-Susca and Danny Pesce while attending a ceremony marking the 11th anniversary of the 9/11 attacks. Their grandchildren, who were also friends, died together as victims of the Sept. 11 terrorist attacks on the World Trade Center. Jason DeCrow/AP
Lt. Paul Ladouceur, with the Panama City Fire Department, helps raise a flag before the 9/11 Remembrance Ceremony in Panama City, Fla. on Sept. 11, 2012. Andrew Wardlow/The News Herald/AP
Marcio Rodriguez holds a United States flag as he pays respects in front of the construction site of One World Trade Center during the 11th anniversary of the Sept. 11 terrorist attacks, Sept. 11, 2012, in New York. Julio Cortez/AP
An unidentified woman sits alone on a bench before a memorial service on the 11th anniversary of the attacks of September 11, 2001 to honor the 184 people who lost their lives when American Airlines flight 77 crashed into the Pentagon outside Washington, September 11, 2012. Larry Downing/Reuters
Jose Gonzales sits in Zuccotti Park before ceremonies marking the 11th anniversary of the September 11, 2001 attacks on the World Trade Center at Ground Zero in New York September 11, 2012. Shannon Stapleton/Reuters
Capt. Kris Small of the Rock Hill, S.C. Fire Department watches as other Rock Hill firefighters put a giant American Flag on the front of Station 4 on Sept. 11. 2012 to commemorate Sept. 11, 2001 terrorist attacks. Andy Burriss/AP
A man carries a painting of the twin towers destroyed during the 9/11 terrorist attacks, at the Los Angeles County Fair in Pomona, California September 5, 2012. Lucy Nicholson /Reuters
The Rev. Justin Stodghill of Gautier, Miss., plays 'Amazing Grace' during a ceremony at Moss Point, Miss., Central Fire Station on Tuesday Sept. 11, 2012 commemorating the Sept. 11, 2001 terrorist attacks. John Fitzhugh/Sun Herald/AP
Jeremy Hamilton places a US flag next to a memorial bearing two pieces of steel from the World Trade Center in Weehawken, New Jersey, across from the skyline of New York, September 11, 2012. Gary Hershorn/Reuters
A woman becomes emotional after reading the name of her father as friends and relatives of the victims of 9/11 gather for a ceremony marking the 11th anniversary of the attacks at the National September 11 Memorial at the World Trade Center site, Tuesday, Sept. 11, 2012, in New York. Jason DeCrow/AP
The World Trade Center Cross, made of intersecting steel beams found in the rubble of the September 11, 2001 attacks on the World Trade Center, was blessed by a Franciscan priest before it became part of the permanent installation exhibit in the 9/11 Memorial and Museum, in New York, on July 23, 2011. Chip East/Reuters/File
Flight attendants Barbara Depwe (2nd r.) Linda Sorenson (r.) and Jean Burke watch the U.S. flag lowered to half staff at the 9/11 Flight Crew Memorial in Grapevine, Texas, Tuesday, Sept. 11, 2012. LM Otero/AP
U.S. President Barack Obama and first lady Michelle Obama observe a moment of silence on the 11th anniversary of the September 11 attacks, on the South Lawn of the White House in Washington, September 11, 2012. Jason Reed/Reuters
Firefighters take a break after climbing the Tennessee Tower to the 28th floor before doing it again, Sunday, Sept. 9, 2012, in Nashville. Firefighters from across Tennessee and six other states paid tribute to the 343 New York City firefighters that perished in the World Trade Center by climbing the Tennessee Tower four times. Each carried a name and a photograph of a firefighter who perished on Sept. 11, 2001. Larry McCormack/The Tennessean/AP
A Fire Department of New York (FDNY) Ladder Company 3 fire truck, which was partially destroyed in the September 11 attacks on the World Trade Center, is raised by a crane before being lowered into an opening in the World Trade Center site below ground level, where it will become part of the permanent installation exhibit in the 9/11 Memorial and Museum in New York, on July 20, 2011. Mike Segar/Reuters/File
Workers weld steel beams salvaged from the north tower of New York's World Trade Center into place at the site of the 9/11 Memorial of Maryland in Baltimore on Aug. 24, 2011. Patrick Semansky/AP/File
This undated handout photo provided by Traci Molloy shows a piece of artwork called “The Feathers of the Phoenix” that was created by about 300 children who lost parents or siblings in the 9/11 attacks. It is being exhibited at the Pentagon along with other large-scale artworks created by children who lost parents or siblings in the 9/11 attacks. AP
U.S. troops with the NATO-led International Security Assistance Force (ISAF) attend a memorial ceremony to mark the 11th anniversary of the 9/11 attacks in the United States, at the NATO base in Kabul September 11, 2012. Omar Sobhani/Reuters
The faces of first responders are seen in artist Eric Blome's Sept. 11 tribute sculpture in Crystal Lake, Ill., on Aug. 31, 2011. Blome's 22-foot-tall, 2-ton sculpture incorporates four twisted eight-foot beams from the World Trade Center into the piece, which is adorned with sculptures that capture the emotion of the day and remembers the people involved. The sculpture was commissioned by the city of Oak Lawn for its 9/11 memorial. Brian Hill/The Daily Herald/AP/File
A woman looks at flowers at the Flight 93 National Memorial ahead of Tuesday's 11th anniversary of the 9/11 attacks, Monday, Sept. 10, 2012, in Shanksville, Pa. Mandel Ngan/AP
Visitors gather around the sculpture designed by New York artist Miya Ando and made from steel recovered from the World Trade Center after the 9/11 terrorist attacks, in Battersea Park in London, on Sept. 5, 2011. The artwork, called 'After 9/11,' was commissioned by the 9 11 London Project to mark the launch of its new education program. Akira Suemori/AP/File
A visitor exits the Arizona 9/11 Memorial, passing a makeshift sign attached to the memorial about the death of Osama bin Laden in Phoenix on May 2, 2011. Ross D. Franklin/AP/File
Chris Kayder and his daughter, Cadence, walk among the flags honoring those who died in the 9/11 attacks Monday, Sept 10, 2012 at the healing field in Tempe, Ariz. Each flag represents a person who lost his or her life in the attacks on 9/11 in 2001, and are marked with placards with the name of victims, information about them. Matt York/AP
The 9/11 memorial near Logan International Airport is seen on a rainy night in Boston on Aug. 9, 2011. Elise Amendola/AP/File
The Tribute in Light illuminates the sky over New York's lower Manhattan skyline a day ahead of the 11-year anniversary of the 9/11 attacks September 10, 2012. The Tribute in Light is an art installation near the site of the World Trade Center in remembrance of the September 11 attacks. Eric Thayer/Reuters
Judy Parisio (r.) and Linda Malbrba make a rubbing of their niece's name, Frances Ann Cilente, who worked at the World Trade Center, during ceremonies marking the 11th anniversary of the 9/11 attacks on the World Trade Center in New York, September 11, 2012. Chang W. Lee/Reuters
New York police officials confirm that a piece of landing gear found this week is believed to be from one of the hijacked planes involved in the Sept.11 attacks at the World Trade Center.
New York City police officials have confirmed that a five-foot-tall piece of landing gear discovered this week is believed to be from one of the hijacked planes involved in the Sept.11 terrorist attacks at the World Trade Center.
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