September 11 memorial events – in pictures

A small US flag stands at memorial of the north tower in New York Photograph: Chris Pedota/AFP/Getty Images

A victim's family member visits the Pentagon memorial before a remembrance ceremony in Arlington, Virginia Photograph: Mark Wilson/Getty Images

A boy listens as Barack Obama speaks during a memorial service at the Pentagon on Tuesday morning Photograph: Brendan Smialowski/AFP/Getty Images

Linda Torrens holds a portrait of her cousin Janine Nicole Gonzalez, who was killed in New York Photograph: Mary Altaffer/AFP/Getty Images

People stand by the north pool of the memorial during ceremonies in New York Photograph: Pool/Getty Images

A man gathers with friends and relatives of the victims at the memorial in New York Photograph: Jason Decrow/AP

Captain John Lam rolls up an etching made of of his uncle Staurt Louis's name at the south tower memorial in New York Photograph: Timothy A Clary/EPA

Visitors to the Flight 93 memorial in Shanksville, Pennsylvania, gather for a sunset service Monday night. Defence secretary Leon Panetta visited the site Monday, and vice-president Joe Biden will speak on Tuesday Photograph: Gene J Puskar/AP

Barack Obama and defence secretary Leon Panetta observe a moment of silence at the Pentagon Photograph: Jason Reed/Reuters

Jose Gonzales sits in Zuccotti Park before the ceremonies in New York Tuesday morning Photograph: Shannon Stapleton/Reuters

Maria Rodriguez wipes her eyes near pictures of a victim before ceremonies in New York. Rodriguez lost her son-in-law Emilio Ortiz during the attacks Photograph: Eric Thayer/Reuters

Ava Kathleen Schmoelzer, 7, from Stamford, Connecticut, places flowers for her aunt on the memorial wall in New York Photograph: Timothy A Clary/Getty Images

Khudeza Begum etches the name of her slain nephew at the memorial in New York Photograph: John Moore/AFP/Getty Images

The annual Tribute in Light illuminates the sky over New York's lower Manhattan skyline Monday night Photograph: Adrees Latif/Reuters