Photos: Remembering 9/11 nine years later

A firefighter salutes as taps is played for victims of the Sept. 11 attacks at the World Trade Center site.  (Jason DeCrow / Associated Press)

Mourners pay their respects to victims of the Sept. 11, 2001, terrorist attacks at the reflecting pool at ground zero in New York’s Lower Manhattan.  (Don Emmert / EPA)

Vice President Joe Biden, wife Jill Biden, New York Mayor Michael R. Bloomberg, right, and Gov. David A. Paterson, far left, hold roses as they stand near the reflecting pool at ground zero during the 9/11 memorial service in New York.  (Chris Hondros / Getty Images)

Flowers float in a reflecting pool in memory of the nearly 3,000 people killed nine years ago when planes hijacked by terrorists crashed into the World Trade Center twin towers in New York, the Pentagon in Arlington, Va., and a field near Shanksville, Pa.  (Chris Hondros / EPA)

A woman holding flowers and a picture of a loved one killed in the attacks attends the 9/11 memorial service at ground zero in New York.  (Lucas Jackson / Getty Images)

A picture of a woman killed in the Sept. 11, 2001, terrorist attacks rests on the edge of the reflecting pool at ground zero in New York.  (Chris Hondros / EPA)

Family and friends of those killed on Sept. 11, 2001, walk toward the reflecting pool at ground zero during this year’s memorial service in New York.  (Chris Hondros / Getty Images)

Firefighters from Ladder Co. 10 and Engine Co. 10 near ground zero pause for a moment of silence at 10:29 a.m. in observance of when the World Trade Center’s North Tower fell.  (Henny Ray Abrams / Getty Images)

A man listens to the slow reading aloud of each 9/11 victim’s name during this year’s memorial service in New York.  (Stephen Chernin / Associated Press)

A firefighter walks near a mural in memory of the Sept. 11, 2001, terrorist attacks near ground zero in New York.  (David Goldman / Associated Press)

President Obama speaks at this year’s 9/11 memorial service at the Pentagon in Arlington, Va. “It was not a religion that attacked us that September day, it was Al Qaeda -- a sorry band of men which perverts religion,” he said. “And just as we condemn intolerance and extremism abroad, so will we stay true to our traditions here at home as a diverse and tolerant nation.”  (Alex Wong / EPA)

President Obama observes a moment of silence during the 9/11 memorial service at the Pentagon.  (Olivier Douliery / EPA)

A 9/11 mourner uses a blanket to keep warm during a memorial service to remember the victims of Flight 93, the hijacked plane that crashed near Shanksville, Pa., nine years ago.  (Archie Carpenter / Getty Images)

First Lady Michelle Obama and former First Lady Laura Bush tour the construction site at the Flight 93 memorial in Shanksville, Pa., with Gordon W. Felt, president of the Families of Flight 93, left, who lost his brother Edward on the flight, and Joanne M. Hanley, superintendent of the Flight 93 National Memorial.  (Gene J. Puskar / Associated Press)

First Lady Michelle Obama speaks during the 9/11 memorial service in Shanksville, Pa.  (Gene J. Puskar / Associated Press)

From left, Gordon W. Felt, president of the Families of Flight 93, Pennsylvania Gov. Ed Rendell, and Interior Secretary Ken Salazar listen as First Lady Michelle Obama speaks during the 9/11 memorial service in Shanksville, Pa.  (Gene J. Puskar / Associated Press)

A carnation is placed on a bench in remembrance of 9/11 victim Kris Romeo Bishundat, who was killed in the attack on the Pentagon.  (Alex Wong / EPA)

American flags surrounding the Washington Monument fly at half-staff in remembrance of the nearly 3,000 people killed in the Sept. 11, 2001, terrorist attacks.  (Ann Heisenfelt / Associated Press)

People gather at the U.S. Embassy at Grosvenor Square in London to remember those killed in the Sept. 11, 2001, terrorist attacks.  (Dan Kitwood / Getty Images)

The names of United Kingdon citizens who died in 9/11 are seen on a plaque at the Grosvenor Square memorial at the U.S. Embassy in London.  (Dan Kitwood / Getty Images)

Members of Molodaya Gvardiya, a pro-Kremlin youth movement, prepare to lay flowers at the U.S. Embassy in Moscow in remembrance of Sept. 11 victims.  (Maxim Shipenkov / EPA)