24 hours in pictures

Aurora, Colorado, US: people arrive at a prayer vigil for the victims of a mass shooting at the Aurora Municipal Centre campus Photograph: Joe Amon/AP

Quezaltepeque, El Salvador: representatives of US gang rehabilitation organisations participate in a meeting with members of the 18th street gang in the Quezaltepeque jail Photograph: Jose Cabezas/AFP/Getty Images

Kolkata, India: National Congress activists apply gulal powdered colours to each other as they celebrate the election as president of the former finance minister Pranab Mukherjee Photograph: Piyal Adhikary/EPA

Eldorado, Illinois, US: an irrigation system shoots water across a drought-striken soybean field Photograph: Jim Lo Scalzo/EPA

Quezon, Philippines: protesters during a rally against President Benigno Aquino III's third state of the nation address Photograph: Bullit Marquez/AP

London, UK: the open water swimmer Colin Hill prepares to swim the course at the Serpentine during a training session in Hyde Park Photograph: Daniel Berehulak/Getty Images

New Delhi, India: a groomer bathes a dog at a pet salon Photograph: Parivartan Sharma/Reuters

Zhangjiajie, China: the French roller skate designer and performer Jean-Yves Blondeau skates down a road on Tianmen Mountain. Wearing a multiple-wheel roller suit, Blondeau took less than 20 minutes to skate 6.69 miles from the peak to the base Photograph: China Daily/Reuters

Warsaw, Poland: a woman looks at flowers and candles placed at the memorial in the Warsaw Ghetto during ceremonies marking the 70th anniversary of the start of Nazi Germany's mass deportation of Jews from to the death camp of Treblinka Photograph: Wojtek Radwanski/AFP/Getty Images

Melchsee-Frutt region, Switzerland: a cow walks in the early morning light in the central Alps Photograph: Sigi Tischler/Keystone

Chongqing, China: a farmer saves his pigs from his flooded farm as more torrential rain was forecast in China's north-east and south-west Photograph: AFP/Getty Images

Yala, Sri Lanka: black face Sri Lankan monkeys drink water from a lake at Yala national park Photograph: Dinuka Liyanawatte/Reuters

Rio de Janeiro, Brazil: a boy refreshes himself with a water machine at Ipanema beach Photograph: Pilar Olivares/Reuters

London, UK: a volunteer walks past the Olympic Stadium Photograph: Emilio Morenatti/AP