The Observer's 20 photographs of the week

Hooked Up, a work by the architectural lighting designer Dean Skira, is displayed during the Hybrid Architecture & Design exhibition in Milan Photograph: Vittorio Zunino Celotto/Getty

A family of Syrian refugees travel in the back of truck, leaving the northern city Aleppo. The UN estimates that four million people have now been displaced inside the country by the civil war, and are in need of international help. This image was taken by Dimitar Dilkoff, who has remained in the country and produced some excellent photojournalism on the plight of the Syrian people Photograph: Dimitar Dilkoff/AFP

A man in the northern Syrian city of Aleppo carefully lowers a basket filled with some of his possessions, as civilians collect items from their damaged apartments before fleeing to safer areas. This image is also by the photojournalist Dimitar Dilkoff Photograph: Dimitar Dilkoff/AFP

Anti-Margaret Thatcher graffiti on a wall on the Falls Road in Belfast following her death on Monday Photograph: Peter Morrison/AP

An image from the London premiere of the show Bianco, by the NoFit State circus company, at the Roundhouse arts venue in the city Photograph: David Levene/Guardian

Sal De Leon, a US border patrol agent, stands near a section of the US-Mexico border fence at La Joya, Texas. According to members of the force, undocumented immigrant crossings have increased by more than 50% in the Rio Grande valley in Texas in the last 12 months Photograph: John Moore/Getty

Vladimir Putin, the Russian president, is confronted by an activist from the women's rights group Femen during a visit to an industry exhibition in Hanover, as Angela Merkel, the German chancellor, looks on Photograph: Sasha Mordovets/Getty

Residents of the Bangladesh capital of Dhaka try to recover their possessions after a fire breaks out at a market in the city Photograph: Munir Uz Zaman/AFP

Residents of a shantytown in Bawana, near the Indian capital of Delhi, weep as they stand near the remains of their home, which was destroyed in a fire Photograph: Manan Vatsyayana/AFP

Supporters of Venezuela's opposition leader and presidential candidate Henrique Capriles attend a campaign rally in the state of Merida Photograph: Carlos Garcia Rawlins/Reuters

A woman takes photographs of Alice, an art installation in Seville, a work by the Spanish artist Cristina Lucas Photograph: Marcelo del Pozo/Reuters

North Koreans visit the Pyongyang 'folk park', which charts the regime's interpretation of the history of the country, from prehistoric to modern times. The image was taken by David Guttenfelder, who was in the country photographing daily life as the regime continues to escalate tension with the US Photograph: David Guttenfelder/AP

North Koreans dance beneath a mosaic painting of the late leader Kim Il-sung during a mass folk dance gathering in Pyongyang Photograph: David Guttenfelder/AP

An aerial view shows work being completed on the roof of the Maracana stadium, which is undergoing renovation for the 2014 World Cup, in Rio de Janeiro Photograph: Ricardo Moraes/Reuters

Brian Aeillo, a taxidermist, adjusts the foot of a stuffed bear called Cannelle, which will be the star attraction of a large exhibition on bears opening at the Museum of Natural History in Toulouse in October Photograph: Remy Gabalda/AFP

A leopard lunges forward at villagers in the settlement of Gothatar in Nepal Photograph: Niranjan Shrestha/AP

Angelina Jolie, the actress and humanitarian campaigner, leaves Lancaster House in London after giving a speech about sexual violence during conflicts, at a meeting of G8 foreign ministers in the city Photograph: Leon Neal/AFP

A anti-government protester stands on a street light and waves a banner reading, 'Glory for the martyrs' during a demonstration in front of the high court in Cairo, Egypt Photograph: Asmaa Waguih/Reuters

Katy Perry, the American singer and Unicef ambassador, shows children how to wash their hands, at a nursery school in Sahavola, Madagascar. Her visit was intended to focus attention on the plight of children in one of the world's poorest countries, which continues to recover from a political crisis and coup in 2009 Photograph: Kate Holt/Unicef/AFP

Fireworks are ignited at the Rijksmuseum in Amsterdam. Thousands gathered outside the museum, the home to The Night Watch, by Rembrandt van Rijn, and other Dutch masterpieces, as Queen Beatrix declared the national museum open after a decade-long renovation Photograph: Michael Kooren/Reuters