Remembering the victims of 9/11 – in pictures

A Port Authority police officer reaches out to touch the 9/11 Memorial in lower Manhattan during ceremonies for the twelfth anniversary of the terrorist attacks
Photograph: Alejandra Villa/Getty Images

Visitors to the Flight 93 National Memorial in Shanksville, Pennsylvania, participate in a sunset ceremony with a giant flag on Tuesday evening Photograph: Gene J Puskar/AP

A woman makes a rubbings of a name at the memorial in New York during ceremonies for the twelfth anniversary of the terrorist attacks Photograph: David Handschuh/Getty Images

A woman looks out at New York's Lower Manhattan and One World Trade Center from inside the 9/11 Empty Sky memorial at Liberty State Park in Jersey City, New Jersey Photograph: Gary Hershorn/Reuters

Retired New York fire marshal Ernie Medaglia, who was at the World Trade Center on 9/11, becomes emotional as he listens to New York governor Andrew Cuomo honoring the day's first responders Photograph: Craig Ruttle/AP

Governor Cuomo rides with firefighters and first responders who are members of the the FDNY Motorcycle Club, from FDNY Rescue 1 headquarters to the World Trade Center site on Wednesday Photograph: Craig Ruttle/AP

In Shanksville, Pennsylvania, a visitor kisses an name on the wall containing the 40 names of the crew and passengers of Flight 93 during a candlelight remembrance on Tuesday evening Photograph: Gene J Puskar/AP

Two people stand at the edge of the north reflecting pool at the 9/11 Memorial during the ceremony in New York Photograph: Justin Lane/AP

A woman takes a photo of flowers before a service at the Pentagon Memorial near Washington, DC. President Obama, Defense Secretary Chuck Hagel and others attended the event Photograph: Brendan Smialowski/AFP/Getty Images

Barack and Michelle Obama are joined by Joe and Jill Biden for a moment of silence on the south lawn of the White House Photograph: Jason Reed/Reuters