Tenth anniversary of 9/11 attacks – in pictures

A memorial pool at the National September 11 Memorial in New York Photograph: Reuters

A bouquet of flowers is tied to a railing overlooking the lower Manhattan skyline Photograph: Spencer Platt/Getty Images

Friends and relatives of the victims of 9/11 gather for a remembrance ceremony Photograph: Jason DeCrow/AP

Robert Peraza, who lost his son, Robert, pauses by his son's name at the north pool at the 9/11 memorial site Photograph: Justin Lane/EPA

A police officer searches a member of the public arriving at the ceremony Photograph: Oded Balilty/AP

Elba Cedeno holds a sign remembering her partner, Catherine Theresa Smith, who died in the terror attacks Photograph: Jason DeCrow/AP

Family members arrive for the memorial ceremony Photograph: Shannon Stapleton/Reuters

Flowers lie at the base of the south pool Photograph: /Getty Images

Friends and relatives of the victims at the World Trade Centre site Photograph: Jason DeCrow/AP

The former US president, George Bush, and President Barack Obama visit the 9/11 memorial Photograph: Mandel Ngan/AFP/Getty Images

Obama at the 9/11 memorial Photograph: Timothy A. Clary/AFP/Getty Images

New York police, firefighters and Port Authority police at one of the entrances to the 9/11 Memorial Plaza Photograph: Chip Somodevilla/AFP/Getty Images

Obama embraces a victim's relative at the World Trade Centre site Photograph: Larry Downing/Reuters

A large crowd gathers at the 9/11 memorial Photograph: Mladen Antonov/AFP/Getty Images

Firefighters observe a moment of silence at the Firemen's Monument at Riverside Park Photograph: Mario Tama/Getty Images

New York City firefighters and police officers hold a flag damaged during the attacks on the World Trade Centre Photograph: Larry Downing/Reuters

Nia Evans, who lost a friend at the World Trade Centre, observes a moment of silence Photograph: Spencer Platt/Getty Images

People reflect during a ceremony at the World Trade Centre site Photograph: Spencer Platt/Getty Images

Mourners at the World Trade Centre site Photograph: Spencer Platt/Getty Images

Relatives of victims of the 9/11 attack on the Pentagon in Washington attend a ceremony marking the 10th anniversary Photograph: Jason Reed/Reuters

Relatives of victims of the attack on the Pentagon gather for a ceremony at the building Photograph: Jason Reed/Reuters

Rita Agnelo touches the name of her son, Joseph Agnelo who was killed in New York on 9/11 Photograph: Seth Wenig/Getty Images