Photos: 9/11 anniversaries throughout the decade

Search, rescue and recovery work continues at the site of the World Trade Center attack. A week after the attacks, New York Mayor Rudy Giuliani said the chances of finding any of the 5,422 people still missing in the rubble of the collapsed World Trade Center were “very, very small.”  (Ryan Remiorz/Reuters Pool)

Man taking photos from window of the September 11 second-year anniversary, Ground Zero, New York.  (Katja Heinemann/Getty Images)

The memorial lights from the World Trade Center light up the lower Manhattan skyline on the 5th anniversary of 9/11.  (Stocktrek Images /Getty Images)

Guests participate in a moment of silence during a ceremony to dedicate the Pentagon Memorial in Washington.  (Molly Riley/Reuters)

Cary Zachmanoglov holds a banner outside the former World Trade Center site, during ceremonies marking the seventh anniversary of the 9/11 attacks.  (Eduardo Munoz / Reuters)

A demonstrator holds a banner next to the former World Trade Center site during ceremonies marking the seventh anniversary of 9/11.  (Eduardo Munoz/Reuters)

New York Mayor Michael Bloomberg (L) listens as a police officer plays the horn for the people whom were killed in the 9/11 attacks.  (Eduardo Munoz./Reuters)

U.S. soldiers salute during a ceremony to mark the anniversary of the 9/11 attacks, at the main U.S. base in Bagram, north of Kabul, Afghanistan.  (Musadeq Sadeq/Reuters)

Mourners stand at the reflecting pool during the eighth anniversary remembrance of the 9/11 attacks.  (Chip East/Reuters)

Police and firefighters act as an honor guard around the reflecting pool during the eighth anniversary remembrance of the 9/11 attacks.  (Chip East/Reuters)

Onlookers stand inside of the “Tribute in Lights” in Manhattan on the eighth anniversary of 9/11.  (Lucas Jackson / Reuters)

Children walk the grounds of the September 11th memorial at the Pentagon before a ceremony marking the eighth anniversary of the 9/11 attacks.  (Joshua Roberts / Reuters)

Some 343 firefighters from five states climbed the 55 stories of the Qwest building twice for a total of 110 stories in remembrance of the firefighters killed on 9/11.  (Mark Leffingwell/Reuters)

A visitor attends a Pentagon event marking the 9th anniversary of the 9/11 attacks.  (Larry Downing / Reuters)

Men demonstrate outside the World Trade Center site in New York.  (Shannon Stapleton/Reuters)

People display signs at a demonstration against the proposed Islamic cultural center and mosque on the ninth anniversary remembrance of the 9/11 attacks.  (Chip East/Reuters)

Deborah Borza cries while listening to first lady Michelle Obabma talk during a memorial service at the Flight 93 Temporary Memorial outside Shanksville, Pa. Borza’s daughter, Deora Bodley, was one of the 40 passengers and crew who died when United Flight 93 crashed.  (Jason Cohn/Reuters)

Gates and Mullen listen as Obama delivers remarks during a ceremony marking the ninth anniversary of the 9/11 attacks at the Pentagon Memorial in Arlington, Va.  (Jonathan Ernst / Reuters)

An opponent of the Muslim community centre and prayer space is restrained by the police from a supporter during a rally outside the World Trade Center site in New York.  (Shannon Stapleton/Reuters)