24 hours in pictures

Buenos Aires, Argentina: a clown boards a La Brugeoise wagon of the Line A subway during the so-called last ride of the historic trains. The Line A will be closed between 12 January and 8 March following a decision by city Mayor Mauricio Macri to replace the fleet with Chinese-made wagons Photograph: Leo La Valle/AFP/Getty Images

Allahabad, India: a Naga sadhu (Hindu holy man) prays in his camp at the Sangam, the confluence of rivers Ganges, Yamuna and mythical Saraswati. Millions of Hindu pilgrims are expected to take part in the Maha Kumbh festival, a religious congregation lasting over a month which takes place every 12 years Photograph: Rajesh Kumar Singh/AP

Gaza Strip, Palestine: a friend of Mohammed al-Mamluk mourns his death at the mortuary of Beit Lahia hospital. Israeli army gunfire killed Mamluk and wounded another man, a spokesman for the territory's emergency services said Photograph: Mohammed Abed/AFP/Getty Images

San Salvador, El Salvador: a Salvadoran dancer known as a historiante at a religious festival in honour of San Antonio Abad Photograph: Stringer/Reuters

Hastings, England: an activist secures himself to an aerial platform as preparations are made to try and prevent land clearing for the construction of a bypass at Crowhurst Photograph: Luke Macgregor/Reuters

Athens, Greece: an Orthodox priest sits on a platform at the Larissa metro station Photograph: Aris Messinis/AFP/Getty Images

Budapest, Hungary: acrobats of the Golden Power team perform on the stage of the Grand Circus of Budapest during a rehearsal for a new production titled The Hungarian Circus Stars Photograph: Attila Kisbenedek/AFP/Getty Images

Heilongjiang province, China: robots deliver dishes to customers at a Robot Restaurant in Harbin. The restaurant uses a total of 20 robots, which range in height, to cook meals and deliver dishes Photograph: Sheng Li/Reuters

Gaza Strip, Palestine: a man rides a horse on the beach at sunset Photograph: Ali Ali/EPA

Allahabad, India: members of a brass band wait for a religious procession to start towards the Sangam, the confluence of the rivers Ganges, Yamuna and mythical Saraswati, ahead of the Maha Kumbh festival Photograph: Manish Swarup/AP

Perth, Australia: a towering red dust storm is seen over the ocean ahead of the cyclone approaching Onslow on the coast of Western Australia. Tug boat worker Brett Martin, who captured the picture 25 nautical miles from the town of Onslow, reported conditions were glassy and flat before the storm hit Photograph: Brett Martin/AFP/Getty Images

London, England: the first official painted portrait of the Duchess of Cambridge goes on show at the National Portrait Gallery. Paul Emsley, the 2007 winner of the gallery's BP Portrait award competition, was chosen by director Sandy Nairne, with input from the duchess, to paint her official portrait Photograph: Nils Jorgensen/Rex Features

Minsk, Belarus: puppies sit in a kennel at a frontier guards' cynology centre [for the study of dogs] near the town of Smorgon. The centre prepares instructors with trained dogs to guard the Belarus border and also sells puppies and dogs which are not fit for service at the border Photograph: Vasily Fedosenko/Reuters

Cucuta, Colombia: a cock trainer holds his trainee in a breeding station. Cockfighting is a widely popular and legal sporting event in much of Latin America. The fight is usually held in an arena with seats for spectators Photograph: Jan Sochor/Getty Images