Week in pictures: 19 - 25 March 2016 - BBC News

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Yoan Valat / EPA
Belgium observed three days of mourning after at least 31 people were killed and 300 injured in explosions at Brussels airport and a metro station on Tuesday. The so-called Islamic State group said it was behind the attacks.





Carlos Barria / Reuters
Barack Obama became the first sitting US president to visit Cuba in 88 years. Mr Obama and Cuban President Raul Castro addressed reporters in a joint news conference on Monday to begin the task of thawing relations between their two counties.





Pablo Martinez Monsivais / AP
From Cuba, the US president and his wife, Michelle, headed to Argentina, where they were invited to step out and try the national dance, the tango.





Alex Coppel / AFP
Formula 1 driver Fernando Alonso walked away uninjured from a huge crash at the Australian Grand Prix when the two-time champion's McLaren was launched into the air and came to rest upside down after hitting the back of Esteban Gutierrez's Haas. Alonso was able to climb out of the wreckage unaided.





Eduardo Soteras / AFP
Supporters of Denis Sassou Nguesso celebrated his re-election as president of Congo-Brazzaville after the constitution was amended to allow him to seek a third term. He won 60% of the vote, against 15% for his nearest challenger, the electoral body announced. The opposition said there had been "massive fraud".





Danny Lawson / PA
More than 5,000 competitors from across the globe are taking part in the World Irish Dancing Championships at Glasgow's Royal Concert Hall.





Toru Hanai / Reuters
Oscar-winning actor Leonardo DiCaprio signed autographs for fans during the Japanese premiere of his movie The Revenant in Tokyo.





Marcelo del Pozo / Reuters
Penitents of San Esteban brotherhood posed before taking part in a procession during Holy Week in the Andalusian capital of Seville, southern Spain.





Andy Wong / EPA
Outside the Great Hall of the People, in Beijing, a Chinese People's Liberation Army soldier formed part on an honour guard at a welcome ceremony for visiting German President Joachim Gauck.





Dylan Martinez/ Reuters
Bjorn posed with two owl butterflies at an event to launch the Sensational Butterflies exhibition at the Natural History Museum in London.





Jeff Pachoud / AFP
Jean-Michel Leuillier hopes his re-creation of the 202BC Battle of Zama, using more than 26,000 Playmobil figures, in the sports hall of Heyrieux, France, will be recorded as the world's biggest diorama.