24 hours in pictures

Washington, US: President Barack Obama is greeted on Capitol Hill after delivering a speech on healthcare to a joint session of Congress Photograph: Charles Dharapak/AP

Port-au-Prince, Haiti: Riot police detain a student holding a book entitled, in French, The Rights of Human Beings and Citizens Photograph: Ramon Espinosa/AP

Ciudad Juarez, Mexico: Recovered heroin addicts kneel down and pray during a morning session at the 'Outcry in the Barrio' ministry Photograph: Tomas Bravo/Reuters

Bamiyan, Afghanistan: Hakima sits in the family cave with her mother, Rokia, and her children Photograph: Paula Bronstein/Getty Images

New Delhi, India: Children wade along a flooded road to reach their school Photograph: Manan Vatsyayana/AFP/Getty

Singapore: Backstage at the Genee International Ballet Competition, Zoe Roberts of Australia watches her fellow competitor stretch during the second round of semi-finals Photograph: Wong Maye-E/AP

Beijing, China: Soldiers practise marching in formation at the 60th National Day Parade Village Photograph: Nir Elias/Reuters

Rome, Italy: Silvio Berlusconi takes part in a meeting with young PDL (People of Freedom) members Photograph: Andreas Solaro/AFP/Getty

Dhaka, Bangladesh: A hippopotamus surfaces in his enclosure in Dhaka zoo Photograph: Munir Uz Zaman/AFP/Getty

Tripoli, Libya: Abdel Basset al-Megrahi sits in a wheelchair in his room at a hospital Photograph: Reuters

Salvador de Bahia, Brazil: Adriano reacts after missing an opportunity during his country's World Cup 2010 qualifier against Chile at Pituacu Stadium Photograph: Mauricio Lima/AFP/Getty

Tegucigalpa, Honduras: Children watch a rally in support of Honduras' ousted president Manuel Zelaya Photograph: Edgard Garrido/Reuters

New York, US: The World Trade Centre building site Photograph: Mark Lennihan/AP