The 20 photographs of the week

This week's best photojournalism from around the world opens with an image by regular contributor Muhammed Muheisen. Here, a girl and her younger brother look at the mud houses of Afghan refugee families which were destroyed by the Capital Development Authority for being built on illegal lands near Islamabad, Pakistan Photograph: Muhammed Muheisen/AP

Residents watch Brazilian Army soldiers use a metal detector and a hoe to search for weapons during an operation in the Mare slums complex in Rio de Janeiro Photograph: Ricardo Moraes/Reuters

Demonstrators clash with police during a protest against the government of Venezuela's president, Nicolás Maduro, in Caracas Photograph: Miguel Gutierrez/EPA

Framed between makeshift clothes lines, a military police officer patrols during the same operation in the Mare slums in Rio de Janeiro Photograph: Felipe Dana/AP

Hands reach out to catch a water bucket as traders, police and firefighters work together to put out a fire at La Terminal, the largest market in Guatemala City Photograph: Moises Castillo/AP

A supporter of ousted president Mohamed Morsi sets off a flare during clashes with security forces at Cairo University in Giza, Egypt Photograph: Amru Taha/AP

At the same demonstration, another Muslim Brotherhood supporter runs through smoke during the clashes outside Cairo University Photograph: Khaled Desouki/AFP

The blast from a Russian Soyuz-FG rocket as it lifts off from Baikonur cosmodrome in Kazakhstan Photograph: Vasily Maximov/AFP

A Chicago Transit Authority train rests on an escalator at O'Hare Airport station after failing to stop. More than 30 people were injured after the train 'climbed over the last stop, jumped up on the sidewalk and then went up the stairs and escalator,' according to Chicago fire commissioner Jose Santiago Photograph: Kenneth Webster/AP

A hairy frogfish attempts to attract prey in shallow waters of Lembeh Strait, Indonesia Photograph: Alexander Mustard/Barcroft Media

Young salmon, known as 'smolts', are pumped through a pipe into a dewatering tower that separates the fish from the water at the Coleman National Fish Hatchery in Anderson, California. Approximately 30m Chinook salmon will be transported to locations downriver due to California's severe drought Photograph: Nick Adams/Reuters

This aerial photograph by Ted S Warren shows the massive mudslide that killed at least 20 people and left dozens missing near Arlington in Washington state Photograph: Ted S Warren/AP

Kosovo Albanian mourners at a reburial ceremony for the remains of 19 Albanians who were killed during the Kosovo war and identified at a mass grave in the village of Krusha e Vogel Photograph: Hazir Reka/Reuters

10-year-old Gullali, who sustained bullet wounds, is comforted by nurse Nicole Burwood at a hospital in Kabul run by the Italian charity Emergency. With more than 40 clinics around the country, Emergency treats all patients for free regardless of which side they have been fighting for in Afghanistan's insurgency Photograph: Zohra Bensemra/Reuters

South African Paralympic athlete Oscar Pistorius arrives in the dock as June Steenkamp, mother of his late girlfriend Reeva Steenkamp, watches him during his murder trial in Pretoria, South Africa Photograph: Ihsaan Haffejee/EPA

West Indies players jump on captain Darren Sammy to celebrate their win over Australia in an ICC Twenty20 Cricket World Cup match in Dhaka, Bangladesh Photograph: Aijaz Rahi/AP

Manchester City's Edin Dzeko scores his second goal against Manchester United at Old Trafford. City won 3-0 to put more pressure on United's new manager David Moyes, whose team must now face German champions Bayern Munich next week in the Champions League Photograph: Jon Super/AP

Spanish police officers watch would-be immigrants climb a fence in the north African Spanish enclave of Melilla. Several hundred people launched a dawn attempt to cross into the Spanish autonomous city, which lies on the northern tip of Morocco but is part of the European Union Photograph: Jose Colon/AFP

Women and children displaced by recent fighting between rebel soldiers and government troops wait in line to collect their food rations in Mingkaman, South Sudan Photograph: Kate Holt/Unicef

Sean Adl-Tabatabai and Sinclair Treadway pose for photographers with the mayor of Camden, Jonathan Simpson, left, after they were married at Camden Town Hall in London. Saturday was the first day gay couples were allowed to tie the knot in England and Wales after the government legalised same-sex marriage last July Photograph: Matt Dunham/AP