24 hours in pictures

Sanaa, Yemen: An anti-government protester flashes the victory sign through a sea of national flags at a demonstration demanding the resignation of the Yemeni president, Ali Abdullah Saleh Photograph: Muhammed Muheisen/AP

São Paulo, Brazil: Members of the Academicos do Tucuruvi samba school dance around a float during the opening night of parades at the Sambadrome as part of carnival celebrations Photograph: Mauricio Lima/AFP/Getty Images

Tunisia-Libya border: Workers from Bangladesh who have fled the violence in Libya wash themselves at a refugee camp Photograph: Sipa Press / Rex Features/Sipa Press / Rex Features

Manila, Philippines: An activist reacts as anti-riot police used their shields to push her back during a protest in front of the US embassy. The rally is held to mark the 100th anniversary of International Women's Day on Tuesday and to protest against the government's adherence to economic interests of foreign countries Photograph: Romeo Ranoco/REUTERS

Paris, France: A model's shoes in the Vivienne Westwood ready to wear autumn/winter 2011/2012 show at Pavillon Concorde Photograph: Pascal Le Segretain/Getty Images

Greenwich, London: New Jersey Nets v Toronto Raptors in the first NBA basketball regular season game to be held in Europe at the O2 Arena. During a time-out, the New Jersey mascot Sly Fox performs a slam-dunk routine after running and bouncing on a trampoline Photograph: Tom Jenkins/Tom Jenkins

Beijing, China: A plainclothes security officer in front of doorway during the opening session of the national people's congress (NPC) in the Great Hall of the People Photograph: Diego Azubel/EPA

Gori, Georgia: A man carries a portrait of Joseph Stalin outside the house where the Soviet dictator was born about 45 miles west of Tbilisi. Georgian communists gathered in Stalin's hometown to mark the anniversary of his death Photograph: David Mdzinarishvili/REUTERS

Birmingham, England: Justin Bieber on stage during the first night of his UK tour at the National Indoor Arena Photograph: Steve Thorne/Redferns

Ras Lanuf, Libya: A rebel shoots at an oil company advertisement board with a portrait of Muammar Gaddafi Photograph: Khaled Elfiqi/EPA

Mumbai, India: Rubina Ali, who acted as Latika in the Oscar-winning film Slumdog Millionaire, amid the ruins of the area where she lived in the slums of Garib Nagar. A fire gutted the large shanty town, which is home to thousands, next to Bandra station in Mumbai's suburbs Photograph: Divyakant Solanki/EPA

Madrid, Spain: French company members of Karnavires perform their show Odysseus in the main square during the Madrid carnival Photograph: Paco Campos/EPA