24 hours in pictures

Malakal, Sudan: A Sudanese woman with ethnic Nuer tribal scarification stands outside her grass hut. The Nuer receive facial markings during initiation into adulthood Photograph: Finbarr O'reilly/Reuters Photograph: Finbarr O'reilly/guardian.co.uk Siliguri, India: A Hindu priest holds a human skull as worshippers offer prayers to the Hindu god Shiva ahead of the religious festival locally known as Charak Photograph: Rupak De Chowdhuri/Reuters Photograph: Rupak De Chowdhuri/guardian.co.uk La Paz, Bolivia: A bodybuilder is sprayed with tan lotion before competing in a regional championship Photograph: Dado Galdieri/AP Photograph: Dado Galdieri/guardian.co.uk Bangkok, Thailand: A protester wearing a gas mask sits in a seized army armoured vehicle after overnight clashes between the military and Red Shirt protesters Photograph: Manpreet Romana/AFP/Getty Images Photograph: Manpreet Romana/guardian.co.uk Mullens, USA: A woman holds a candle and her dog Gizmo during a vigil to commemorate the 29 miners who were killed in an explosion at Massey Energy Co's Upper Big Branch mine Photograph: Carolyn Kaster/AP Photograph: Carolyn Kaster/guardian.co.uk Erg Merzouga, Morocco: Competitors walk during the 25th Marathon des Sables. The marathon covers a distance equivalent to six marathons over six days through the southern Moroccan desert Photograph: Pierre Verdy/AFP/Getty Images Photograph: Pierre Verdy/guardian.co.uk Niteroi, Brazil: Rescue workers watch as they give instructions to a bulldozer removing mud during a search for victims after a landslide Photograph: Felipe Dana/AP Photograph: Felipe Dana/guardian.co.uk Sydney, Australia: Competitors jump into the water to begin the first swim leg during the first men's race in the ITU triathlon series Photograph: Rick Rycroft/AP Photograph: Rick Rycroft/guardian.co.uk Biegen, Germany: A stork covered in a light blue colour pairs with a female white stork in their nest. Experts assume that the colouring of the plumage is caused by blue paint Photograph: Michael Urban/AFP/Getty Images Photograph: Michael Urban/guardian.co.uk Kandahar, Afghanistan: An Afghan deminer from ECC/G4S-ordnance management searches for unexploded explosive devices on an old battleground Photograph: Tim Wimborne/Reuters Photograph: Tim Wimborne/guardian.co.uk Washington, USA: Workers erect iron fences around the Washington Convention Centre ahead of the nuclear security summit Photograph: Jewel Samad/AFP/Getty Images Photograph: Jewel Samad/guardian.co.uk Warsaw, Poland: A sea of candles laid out in front of the presidential palace in the early hours following the Polish government Tupolev Tu-154 aircraft crash near Smolensk airport Photograph: Joe Klamar/AFP/Getty Images Photograph: Joe Klamar/guardian.co.uk