a woman places her hand on a memorial
The September 11 Memorial in Lower Manhattan before a ceremony commemorating the 25th anniversary of the terrorist attacksPhotograph: Dave Sanders/The New York Times via AP
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firefighters carry flags
New York City firefighters march near the memorialPhotograph: Angelina Katsanis/AP
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people visit a memorial
A woman visits the memorial during the ceremonyPhotograph: Spencer Platt/Pool via Reuters
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a sand sculpture shows a bald eagle and the words ‘never forget 9/11’
A tribute made of sand at sunrise in the Long Island town of Point Lookout, New York, on FridayPhotograph: Shannon Stapleton/Reuters
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a child touches a flower
The reflecting pools at the 9/11 MemorialPhotograph: Getty Images
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a woman holds a picture of a loved one
The 25th anniversary commemorationPhotograph: Spencer Platt/AFP/Getty Images
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people place flowers and notes on empty chairs
People place flowers and notes on 2,753 empty chairs in Bryant Park, representing the lives lost at the World Trade CenterPhotograph: Charly Triballeau/AFP/Getty Images
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A US flag is unfurled from the roof of the Pentagon
A US flag is unfurled at the Pentagon at a ceremony marking the 25th anniversary of the attack on the site in Virginia, close to Washington DCPhotograph: Elizabeth Frantz/Reuters
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a park ranger places a wreath at a memorial
A National Park Service ranger places a wreath at the wall of names at the Flight 93 National Memorial near Shanksville, PennsylvaniaPhotograph: Gene J Puskar/AP
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A picture of a man with text on a telephone poll under a sign that says 911/Never 25 Forget.
A picture of a victim of the 11 September 2001 attacks at the memorial in New York City on FridayPhotograph: David Dee Delgado/AFP/Getty Images
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Members of the military look on as two columns appear on the floor from light overhead
Members of the military look on as two columns appear on the floor inside the Oculus transportation hub at the World Trade CenterPhotograph: Heather Khalifa/AP
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A man holds a New York Fire Department helmet with the name of a victim
A man holds a New York fire department helmet with the name of a victim at the September 11 MemorialPhotograph: Davide Dee Delgado/AFP via AP
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a woman prays while seated
The Flight 93 National Memorial near Shanksville, PennsylvaniaPhotograph: Nathan Howard/Reuters
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flowers adorn a memorial with a skyscraper in the background
One World Trade Center, beyond the National September 11 MemorialPhotograph: Angela Weiss/AFP/Getty Images
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police and firefighters hold a large US flag during a ceremony
Members of the New York police and fire departments raise US flagsPhotograph: Olga Fedorova/Pool EPA/AP
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A little girl places items on the memorial during a ceremony
The National 9/11 Memorial in New York City on FridayPhotograph: Spencer Platt/AFP/Getty Images
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a man touches a wall of a memorial
A man touches the wall of the Empty Sky 9/11 memorial in Jersey City, New Jersey, as the sun rises behind lower Manhattan and One World Trade CenterPhotograph: Gary Hershorn/Getty Images
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people gather at a vigil
Visitors gather for memorial services for Flight 93 near Shanksville, PennsylvaniaPhotograph: Jeff Swensen/Getty Images
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A rose adorns the lapel of former a New York police officer
A rose adorns the lapel of a former New York City police officer at the Fallen Firefighter’s Memorial in Nashville, TennesseePhotograph: George Walker IV/AP
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a woman cries at a memorial
A woman cries on one of the chairs set up in Bryant Park in midtown ManhattanPhotograph: Deccio Serrano/NurPhoto/Shutterstock
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Military staff and guests bow their heads during an observance ceremony
Military staff and guests bow their heads during an observance ceremony at the Pentagon in Washington DCPhotograph: Mark Schiefelbein/AP
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a man holds prayer beads while standing at a memorial
Memorial observances at the site of the World Trade Center in New York CityPhotograph: Olga Fedorova/EPA
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A large American flag hangs between two fire trucks with One World Trade Center visible in the distance
An American flag hangs between two fire trucks in Jersey City, New Jersey, with One World Trade Center in the distancePhotograph: Andrés Kudacki/Getty Images
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