President Barack Obama and first lady Michelle Obama make their way to board Air Force One on Sept. 11, 2011, at Andrews Air Force Base in Maryland. Obama was travelling to New York City and Shanksville, Pennsylvania to attend ceremonies marking the 10th anniversary of the 2001 terrorist attacks. Photographer: Mandel Ngan/AFP/Getty Images


President Barack Obama and first lady Michelle Obama make their way to board Air Force One on Sept. 11, 2011, at Andrews Air Force Base in Maryland. Obama was travelling to New York City and Shanksville, Pennsylvania to attend ceremonies marking the 10th anniversary of the 2001 terrorist attacks. Photographer: Mandel Ngan/AFP/Getty Images


September 11 Remembered

The Obamas Leave for New York
The Obamas Leave for New York

President Barack Obama and first lady Michelle Obama make their way to board Air Force One on Sept. 11, 2011, at Andrews Air Force Base in Maryland. Obama was travelling to New York City and Shanksville, Pennsylvania to attend ceremonies marking the 10th anniversary of the 2001 terrorist attacks. Photographer: Mandel Ngan/AFP/Getty Images


At the North Pool
At the North Pool

President Obama, first lady Michelle Obama and former President Bush walk past the North Memorial Pool where the World Trade Center once stood in lower Manhattan. Photographer: Justin Lane/AFP/Getty Images

Visiting the Reflecting Pool
Visiting the Reflecting Pool

President Obama and former President George W. Bush visit the memorial at Ground Zero on Sept. 11, 2011, in New York. Photographer: Mandel Ngan/AFP/GettyImages

Police and Firefighters March
Police and Firefighters March

Police and firefighters carry a folded flag past a pool at the National Sept. 11 Memorial and Museum in lower Manhattan. Photographer: Seth Wenig/Pool/Getty Images

Embracing the Family Members of the Victims
Embracing the Family Members of the Victims

President Obama embraces family members of the victims of the attacks at the
National Sept. 11 Memorial and Museum in lower Manhattan.  Photographer: Chip
Somodevilla/Getty Images

Security
Security

A New York City police officer checks a regional police officer at an entrance to the Ground Zero site, where President Obama, former President George W. Bush  and many local officials were present at the September 11 memorial ceremony. Photographer: Glenna Gordon/Bloomberg


Speaking to the Relatives
Speaking to the Relatives

President Obama addresses the relatives of almost 3,000 victims who died at the same site in New York a decade ago. Photographer: Mladen Antonov/AFP/Getty Images

8:46 a.m.
8:46 a.m.

President Obama, Michelle Obama and former President Bush lead a moment of
silence at the time American Airlines Flight 11 struck the north tower of the
World Trade Center. Photographer: Stan Honda/Getty Images

Ground Zero
Ground Zero

Attendees of the tenth anniversary ceremonies of the Sept. 11 terrorist attacks face the North Memorial Pool of the Ground Zero memorial at the World Trade Center site. Photographer: Andrew Burton/Getty Images

Remembering Loved Ones
Remembering Loved Ones

Lorraine Calderon kisses the name of her uncle, Daniel Lugo, who was killed ten years ago, at the National Sept. 11 Memorial and Museum in New York. Photographer: Seth Wenig/Pool/Getty Images

Gathering
Gathering

Thousands of people gathered in lower Manhattan to mark the passing of ten years since the terrorist attacks on the World Trade Center, which claimed 2,749 lives. Photographer: Glenna Gordon/Bloomberg

Tributes
Tributes
Photographer: Glenna Gordon/Bloomberg
Reading the Names of the Victims
Reading the Names of the Victims

Family members read the names of the victims at the National Sept. 11 Memorial and Museum in lower Manhattan. Photographer: Allan Tannenbaum/Pool/Getty Images

Securing Lower Manhattan
Securing Lower Manhattan

Security was heightened all over New York City and especially in lower Manhattan in response to reports of a credible threat related to the tenth anniversary of the Sept. 11 attacks.  Photographer: Glenna Gordon/Bloomberg

Mayor Michael Bloomberg
Mayor Michael Bloomberg

New York City Mayor Michael Bloomberg speaks at the tenth anniversary ceremonies of the Sept. 11 terrorist attacks at the World Trade Center site. Photographer: Allan Tannenbaum/Pool/Getty Images

Former Mayor Rudolph Giuliani
Former Mayor Rudolph Giuliani

Former New York City Mayor Rudolph W. Giuliani, accompanied by his wife Judith Nathan, pays tribute to Sept. 11 victims and their families during the ceremonies at New York’s World Trade Center. Photographer: Stan Honda/AFP/Getty Images

The South Memorial Pool
The South Memorial Pool

Family members grieve at the wall of the South Memorial Pool of the Sept. 11 memorial in lower Manhattan. Photographer: Timothy A. Clary/Pool/Getty Images

In Memory
In Memory
Photographer: Glenna Gordon/Bloomberg
Trinity Church
Trinity Church

A father and daughter lit incense and said prayers at Trinity Church in lower Manhattan on the tenth anniversary of the Sept. 11 attacks. Photographer: Glenna Gordon/Bloomberg

Tributes to the Victims
Tributes to the Victims

Friends and family of the nearly 3,000 victims of the September 11, 2001 attacks held signs in tribute. Photographer: Glenna Gordon/Bloomberg


Mourning
Mourning

Photographer: Glenna Gordon/Bloomberg

Remembering Loved Ones
Remembering Loved Ones
Photographer: Glenna Gordon/Bloomberg
Messages on Ribbons
Messages on Ribbons

At Trinity Church, in the shadow of Ground Zero, notes were written on ribbons and tied to the  wrought iron fence in remembrance of loved ones lost in the Sept. 11, 2001 attacks. Photographer: Glenna Gordon/Bloomberg

Ribbons of Remembrance
Ribbons of Remembrance

Photographer: Glenna Gordon/Bloomberg

Sounds of the Day
Sounds of the Day

Philip Belpasso, a street flautist who has performed at Ground Zero for years, sat in front of Trinity Church playing "Amazing  Grace." Photographer: Glenna Gordon/Bloomberg

Outside Trinity Church
Outside Trinity Church
Photographer: Glenna Gordon/Bloomberg
Bagpipe Performance
Bagpipe Performance
The Fire Department of New York performed on bagpipes late in the evening on September 11, 2011. Photographer: Glenna Gordon/Bloomberg
Tribute in Light
Tribute in Light
The annual “Tribute in Light” memorial echoing the twin towers of the World Trade Center illuminates the night sky during the 10th Anniversary of the September 11, 2001 attacks at the lower Manhattan site of the World Trade Center on September 11, 2011, in this view from Bayonne, New Jersey. Photographer: Stan Honda/AFP/Getty Images