The 20 photographs of the week

In a photograph by Oliver Weiken, a regular contributor to this gallery, Palestinians search for survivors amid the debris of a house destroyed by an Israeli air strike in the Beach refugee camp, northern Gaza City. The attack came minutes after a unilateral humanitarian ceasefire Photograph: Oliver Weiken/EPA

A Palestinian boy, wounded in an Israeli strike on a house in Beit Lahiya, waits to be treated at the emergency room of the Kamal Adwan hospital Photograph: Lefteris Pitarakis/AP

Marco Longari was also in Gaza covering the Israeli offensive. Here, a Palestinian man walks past writing on a wall allegedly left behind by Israeli soldiers who used the Beit Hanun high school for girls as an advanced base during the military offensive against Hamas. On Tuesday, a 72-hour truce began and Palestinians ventured out to find scenes of destruction Photograph: Marco Longari/AFP

And, in another photography by Marco Longari, a Palestinian man leads a cow on a street in front of destroyed buildings in Beit Lahia in the northern Gaza Strip. Hamas vowed to continue its fight against Israel, which has cost more than 1,670 Palestinian lives Photograph: Marco Longari/AFP

This week saw the 100th anniversary of the outbreak of the first world war. Here, Catherine, Duchess of Cambridge, King Philippe of Belgium, David Cameron and Prince William pay their respects to the fallen at St Symphorien Military Cemetery in Mons, Belgium Photograph: Chris Jackson/Getty

Photographer Christopher Furlong was also in Belgium for the centenary. Here, stone crosses marking the graves of German soldiers are partially covered by the growing trunk of a tree in Hooglede German military cemetery Photograph: Christopher Furlong/Getty

In another event to commemorate the anniversary, people take pictures of an installation entitled Blood Swept Lands and Seas of Red, by artist Paul Cummins, after its official unveiling in the dry moat of the Tower of London Photograph: Matt Dunham/AP

Finally from the first world war centenary, Getty and Observer photographers have taken images from the same viewpoint of key photographs during the first world war in a project which can be viewed here. Here, members of a Royal Garrison Artillery working party are carrying duck-boards across the frozen Somme canal at Frise, France, March 1917. The archive photograph is overlaid on a contemporary image taken from the same viewpoint Photograph: Peter Macdiarmid/Lt J W Brooke/IWM/Getty

Photographer Bulent Kilic continued his strong reportage from Ukraine. In this photograph, a Ukrainian girl cries as she stands on the road with her luggage after leaving her home near the village of Hrabove. The insurgent stronghold of Lugansk in eastern Ukraine is on the verge of a humanitarian catastrophe, the mayor warned, as a siege by government troops has seen water, electricity and food supplies cut off Photograph: Bulent Kilic/AFP

A rabbit moves amid the rubble following a massive earthquake in Longtoushan, China Photograph: Andy Wong/AP

An injured girl cries at Ludian hospital after the earthquake. At least 398 people have been confirmed dead after the magnitude 6.1 tremor devastated China's Yunnan province Photograph: AFP/Getty

A photograph hangs on the wall in a room once used as a torture chamber at the notorious Khmer Rouge Tuol Sleng prison which is now the Genocide Museum in Phnom Penh. A UN-backed war crimes tribunal found the Khmer Rouge’s Brother No 2, Nuon Chea, and former head of state, Khieu Samphan, guilty of crimes against humanity and sentenced the two elderly men to life imprisonment, in a move heralded by human rights groups as a 'historic victory' for the nation Photograph: Damir Sagolj/Reuters

A Liberian woman weeps over the death of a relative from Ebola on the outskirts of Monrovia, Liberia. According to statistics from the World Health Organisation, 932 patients have died from Ebola in west Africa with most of the latest deaths reported in Liberia Photograph: Ahmed Jallanzo/EPA

Displaced people flee from the violence caused by Islamic State militants in the province of Nineveh, Iraq. The United States began to drop relief supplies to beleaguered Yazidi refugees trapped on Mount Sinjar. Barack Obama also authorised targeted air strikes against the militant jihadists to assist in the protection of civilians Photograph: Reuters

An Indian student participates in a peace rally in Mumbai to mark the 69th anniversary of the US dropping an atomic bomb on Hiroshima Photograph: Rafiq Maqbool/AP

Activity continued to increase at the Tungurahua volcano in the Cordillera Oriental mountains of Ecuador. Since the first ash emission a week ago, more and stronger explosions, as well as phases of continuous ash and gas emissions, have taken place Photograph: Jose Jacome/EPA

Revellers ride during the brass band festival in the Serbian village of Guca Photograph: Marko Djurica/Reuters

A black rhinoceros is flown from the Eastern Cape to a reserve in KwaZulu-Natal as part of a scheme to increase the population of the critically endangered species Photograph: Green Renaissance/Barcroft Media

A man transports a dead whale shark after it was caught in a fisherman's net in Yangzhi, China Photograph: China Stringer Network/Reuters

Finally back to the northern Gaza Strip where a relative of the Wahdan family looks at a badly damaged house at the Jabaliya refugee camp. Witnesses said it was hit by an Israeli air strike that killed three members of the family Photograph: Suhaib Salem/Reuters