The Observer's 20 photographs of the week

A total of 78 people died in a train crash in the northern Spanish region of Galicia, the worst in Spain for 40 years. Here, two men comfort an injured woman next to a derailed carriage near the city of Santiago de Compostela Photograph: AFP

The driver of the derailed train, Francisco José Garzón Amo, is helped by two men after the accident. He was later put under police surveillance in hospital after the train was reported to be moving at twice the legal speed limit Photograph: AFP

This image from photographer Leon Neal of Prince William and the Duchess of Cambridge with their newborn baby was one of the first received by this picture desk on Tuesday evening. Approximately 3,000 more images of the event followed in the next five hours Photograph: Leon Neal/AFP

The weather in the United Kingdom remained hot and humid although thunderstorms and driving rain led to flooding in some parts of the country on Tuesday. Here, in another photograph by Leon Neal, people enjoy the sun as they eat their lunch at The Scoop outdoor amphitheatre in London Photograph: Leon Neal/AFP

A tree frog clutches a leaf angled towards the rain for shelter as it sits on a plant in Jember, East Java. It held on to the stem for at least 30 minutes during the rainstorm Photograph: Penkdix Palme/Newsteam

Women walk on a windy day outside Kabul, Afghanistan Photograph: Mohammad Ismail/Reuters

In a picture taken with an underwater camera Mexico's Ivan Garcia and German Sanchez compete in the men's 10m synchro platform event in Barcelona Photograph: Francois Xavier Marit/AFP

Two aluminium figures of the art installation 'Encounters and Positions' by artist Hubertus von der Goltzare are silhouetted on a rooftop in Berlin, Germany Photograph: Gero Breloer/AP

In this potent image by photographer Mohammed Al-Shaikh, a regular contributor to this gallery, a protester stands amidst teargas fired by riot police. Clashed erupted following a protest against the ruling regime in the village of Diraz, Bahrain. The photographer has been documenting the protests by the Shia majority against the regime of the Sunni Al-Khalifa dynasty since February 2011 Photograph: Mohammed Al-Shaikh/AFP

An Israeli immigrant from the US is cheered by a crowd after her arrival at the Ben Gurion airport, near Tel Aviv, on the eve of new peace talks between Israel and Palestine in Washington. Photograph: Oliver Weiken/EPA

A Palestinian girl is photographed by Majdi Fatji during the month of Ramadam in the Nuseirat refugee camp in Gaza Photograph: Majdi Fathi/Corbis

A pair of Indian parrot hatchlings are photographed in Dimapur, India, after being caught in a forest by a local hunter and offered for sale. Despite a 20-year ban on trade in bird species, hundreds of parrots are collected and traded annually in India Photograph: Strdel/AFP

Pope Francis greets the Catholic faithful on Copacabana beach in Rio de Janeiro, Brazil Photograph: Stefano Rellandini/Reuters

A member of the Lou Nuer tribe returns home to the village of Yuai in South Sudan after fighting against the Yau Yau rebels Photograph: Camille Lepage/AFP

An injured woman receives treatment at a hospital after a 6.6 magnitude earthquake hit Dingxi in China Photograph: China Stringer Network/Reuters

In Madrid, police officers detain a demonstrator during a protest against the government's proposal to exclude lesbian couples and single women from the right to assisted reproduction techniques such as artificial insemination and in vitro fertilisation Photograph: Susana Vera/Reuters

A Free Syrian Army fighter takes up a position inside a house in Aleppo's Salaheddine neighbourhood. UN Secretary General Ban Ki-Moon said this week that more than 100,000 people have now been killed in the conflict in Syria Photograph: Muzaffar Salman/Reuters

Performers participate in the Arirang mass games in Pyongyang, North Korea, on the eve of the 60th anniversary of the Korean War armistice Photograph: Wong Maye-E/AP

Photographer Ed Jones was also in Pyongyang covering the 60th anniversary of the armistice. Here, soldiers march through Kim Il-Sung square during a military parade Photograph: Ed Jones/AFP/Getty

The turmoil that has convulsed Egypt recently deepened when it was reported that security forces shot dead more than 130 Muslim Brotherhood supporters before pre-dawn prayers on Saturday. Here, in Manu Brabo's photograph, doctors treat a supporter of Egypt's ousted President Mohammed Morsi who was injured during the clashes in Cairo Photograph: Manu Brabo/AP