A police officer stands by as family members of victims of the Sept. 11, 2001, attacks on the World Trade Center pay their respects at the reflecting pool in ground zero during a ceremony commemorating the eighth anniversary of the attacks Friday, Sept. 11, 2009, in New York.
Family members of victims of the Sept. 11 attacks on the World Trade Center pay their respects at the reflecting pool in ground zero during a ceremony commemorating the eighth anniversary of the attacks Friday, Sept. 11, 2009, in New York.
President Joe Biden, left, his wife, Jill Biden, center, and New York City Mayor Michael Bloomberg walk to a reflecting pool at the World Trade Center site on the eighth anniversary of the Sept. 11, terrorist attacks in New York, Friday, Sept. 11, 2009.
Standing in a steady rain, President Barack Obama bows his head as he lays a wreath at the Pentagon Memorial, marking the eighth anniversary of the Sept. 11 attacks, Friday, Sept. 11, 2009, at the Pentagon.
President Barack Obama and first lady Michelle Obama stand with White House staff members as they participate in a moment of silence marking the eighth anniversary of the Sept. 11 attacks, Friday, Sept. 11, 2009, on South Lawn of the White House in Washington.
Former Secretary of State Colin Powell holds his hand over his heart during the Presentation and Posting of the Colors during a ceremony near the temporary memorial and crash site of United Flight 93, Friday, Sept. 11, 2009, in Shanksville, Pa. United Flight 93 crashed there Sept. 11, 2001, after passengers and crew diverted the hijacked airplane from its intended target Washington, D.C.
Roses thrown by mourners float in a reflecting pool at the World Trade Center site in New York during a ceremony to commemorate the eighth anniversary of the Sept. 11 terrorist attacks Friday, Sept. 11, 2009, in New York.
Pamela Smith, right, from London, pays her respects during the first ringing of the bell during a ceremony marking the eighth anniversary of the attacks on the World Trade Center, Friday, Sept. 11, 2009, in New York.
Marta Waisman, right, from New York, holds a photo of her daughter who died in the Sept. 11, 2001, attack on the World Trade Center, as she attends ceremonies marking the eighth anniversary, in New York on Friday, Sept. 11, 2009.
Members of the Vermont Air National Guard 158th Fighter Wing stand for a moment of silence as F-16 fighters do a flyover in memory of the Sept. 11 attacks in South Burlington, Vt., Friday, Sept. 11, 2009. The fighter wing's F-16s were the first planes to arrive at Ground Zero during the attack on the twin towers in New York in 2001.
Members of the U.S. Submarine Veterans Groton Base Gun Battery mark the 8th anniversary of the Sept. 11th terrorist with an 11-minute volley of shots from a ceremonial salute canon, at the U.S. Submarine Veterans WWII Memorial East in Groton, Conn.. The firing began at 8:46 a.m., and a shot was fired every minute for 11-minutes.
U.S. soldiers from Combined Security Transition Command Afghanistan stand in silence for a minute, during a Sept. 11 remembrance ceremony at Camp Eggers, in Kabul, Afghanistan, Friday, Sept. 11, 2009.
U.S. soldiers lower the flag during a 9/11 remembrance ceremony at the U.S. embassy in Kabul, Afghanistan, Friday, Sept. 11, 2009.
A U.S. soldier reacts during a ceremony to mark the anniversary of Sept. 11 2001, at the main U.S. base, in Bagram, north of Kabul, Afghanistan, Friday, Sept. 11, 2009.
U. S. soldiers from Combined Security Transition Command Afghanistan stand in silence for a minute, during Sept. 11 remembrance ceremony at Camp Eggers, in Kabul, Afghanistan, Friday, Sept.11, 2009.
U.S. ambassador Karl Eikenberry speaks during 9/11 remembrance ceremony at the U.S. embassy in Kabul, Afghanistan, Friday, Sept. 11, 2009.
U. S. ambassador Karl Eikenberry, right, and Minister of Foreign Affairs, Dr. Rangin Dadfar Spanta, left, stand in a silence, during 9/11 remembrance ceremony at the U.S. embassy in Kabul, Afghanistan, Friday, Sept. 11, 2009.