Reaction to the Arizona shootings - in pictures

A makeshift memorial set up outside the University Medical Centre in Tucson, Arizona, where Congresswoman Gabrielle Giffords is being treated Photograph: Dan Chung for the Guardian

Pictures of victims and notes of condolence left at a makeshift memorial in front of the University Medical Centre Photograph: Mike Nelson/EPA

People gather at a makeshift memorial in front of the University Medical Centre in Tucson, Arizona. Members of the public continue to leave flowers, balloons and candles on the front lawn of the hospital Photograph: Dan Chung for the Guardian

Dr Peter Rhee, chief trauma and critical care emergency surgery doctor at University Medical Centre, describes in more detail the gunshot wound Gabrielle Giffords received to reporters after a news briefing Photograph: Ross D. Franklin/AP

Flowers placed outside the Capitol building for victims of the assassination attempt on Democratic congresswoman Gabrielle Giffords Photograph: Michael Reynolds/EPA

A man hands out copies of a statement from the family of Jared Lee Loughner in Tucson. The family of Loughner expressed sorrow over the 'heinous events' Photograph: Eric Thayer/Reuters

FBI agents continue to investigate the crime scene in front of the Safeway store on the corner of West Ina and North Oracle roads in Tucson Photograph: KeystoneUSA-ZUMA/Rex Features

Carol Locust, an Eastern Cherokee Native American traditional practitioner, spreads incense with a feather for the victims of the 8 January shooting at a makeshift memorial set up outside University Medical Center in Tucson, Arizona Photograph: Mike Segar/Reuters

A police officer looks through binoculars from a church building across the street from St Odilia's church in Tucson, Arizona. A memorial service was being held at St Odilia's for the victims of the shootings Photograph: Mike Segar/Reuters

Roxanna Green, centre, mother of nine-year-old Christina-Taylor Green, during community mass at St Odilla church in Tucson Photograph: David Sanders/AP

Alex Velasquez, left, Kristi Campuzano, second from left, and Francine Figueroa rest under a blanket as they wait to get tickets to see President Obama speak at McKale Centre in Tucson. Searching for unity out of tragedy, Obama will honour the victims of the Arizona mass shooting in personal terms and remind those in grief that an entire nation is with them Photograph: Jack Kurtz/AP

Women waiting in line for a memorial service for victims of the 8 January shooting look at the campus paper at the University of Arizona in Tucson Photograph: Rick Wilking/Reuters

US president Barack Obama and first lady, Michelle Obama, board Air Force One at the Andrews airforce base in Maryland to leave for Tucson, Arizona, to attend the memorial event, Together We Thrive: Tucson and America Photograph: Jewel Samad/AFP/Getty Images